Creamy Gluten Free Green Bean Casserole

Welcome to the ultimate guide for preparing a truly exceptional gluten-free green bean casserole. This isn’t just another holiday side dish; it’s a nostalgic classic reimagined, crafted with care from scratch to be completely free of grains and dairy. Get ready to impress your family and friends this Thanksgiving with a casserole that delivers on flavor, texture, and dietary inclusivity, all while avoiding canned soups and store-bought fried onions.

For many, Thanksgiving dinner simply isn’t complete without a comforting green bean casserole. It holds a special place at the holiday table, alongside beloved dishes like Sweet Potato Casserole or Gluten-free Cornbread Stuffing. While it wasn’t a staple in my childhood home, I’ve since become a passionate convert, dedicated to perfecting a homemade version that caters to modern dietary needs without sacrificing any of that cherished, traditional taste. This recipe ensures everyone can enjoy this holiday favorite, featuring a rich, velvety homemade cream of mushroom soup and perfectly crisp, golden French-fried onions, all made from wholesome, natural ingredients.

Gone are the days when you needed to rely on convenience products. With this recipe, every component – from the creamy mushroom base to the crunchy onion topping – is made entirely from scratch, ensuring superior flavor and quality.

Table of Contents

Why You’ll Love This Green Bean Casserole

This isn’t just a recipe; it’s an invitation to elevate your holiday cooking and embrace the rich tradition of homemade goodness. Here’s why this particular green bean casserole will become your new go-to:

• A Nourishing Nostalgic Classic: Green bean casserole is more than just a dish; it’s a symbol of togetherness and holiday cheer. This recipe brings that comforting nostalgia to your table, but with a wholesome twist. By eliminating gluten and dairy, we’re making this beloved classic accessible to more people, ensuring that everyone can partake in the joy of Thanksgiving traditions. It’s a testament to how traditional flavors can be preserved and even enhanced with thoughtful, inclusive ingredient choices.
• Unbeatable From-Scratch Flavor: While store-bought shortcuts offer convenience, nothing compares to the depth of flavor achieved with homemade components. This recipe celebrates the “labor of love” approach, transforming simple ingredients into a gourmet experience. The homemade cream of mushroom soup is rich and savory, a far cry from its canned counterparts, and the French-fried onions offer an unparalleled crispiness and authentic onion flavor. We only prepare green bean casserole once or twice a year, so why not make it truly extraordinary? This is one of those dishes, like slow cooker applesauce, where making it from scratch genuinely makes a difference, turning a simple side into the star of your meal.
• Dietary-Friendly Indulgence: Navigating holiday meals with dietary restrictions can be challenging. This recipe solves that problem by being naturally gluten-free and dairy-free, without compromising on taste or texture. It’s perfect for those with sensitivities to grains, lactose, or other common allergens, allowing everyone to enjoy a truly indulgent holiday feast without worry. You won’t miss the traditional ingredients one bit!
• Made with Wholesome Ingredients: Say goodbye to artificial flavors, excessive sodium, and unknown additives often found in processed foods. This recipe uses fresh vegetables, healthy fats, and natural thickeners, ensuring that every bite is not only delicious but also contributes to a healthier meal. It’s a clean-eating version of a classic comfort food.

The Secret to Success: Homemade Components

The true magic of this gluten-free green bean casserole lies in its two primary homemade elements: the luscious cream of mushroom soup and the perfectly crispy French-fried onions. These components are simple to prepare but make an enormous difference in the overall taste and quality of the final dish.

Crafting the Creamy Mushroom Soup Base

Forget the condensed cans! Our homemade cream of mushroom soup forms the heart of this casserole, delivering a rich, earthy flavor and a silky-smooth texture. It’s incredibly easy to make and can even be prepared a day in advance, saving you precious time on Thanksgiving. The combination of fresh mushrooms, aromatic garlic, savory broth, and creamy coconut milk creates a base that’s flavorful enough to enjoy on its own.

Perfecting the French-Fried Onions

The iconic crunchy topping is often overlooked but is crucial to the green bean casserole experience. Our from-scratch French-fried onions are light, incredibly crispy, and infused with authentic onion flavor. They provide the ideal contrast to the creamy green beans below. While they require a bit of hands-on frying, the effort is well worth it for the superior taste and satisfying crunch that store-bought versions simply cannot match.

Recipe Ingredients Deep Dive

Every ingredient plays a vital role in achieving the perfect balance of flavors and textures in this gluten-free green bean casserole. Below, we’ll explore the key components and why they’re essential.

• For the Cream of Mushroom Soup:
  • Mushrooms: Fresh mushrooms are the star here. You can use cremini (baby bella) mushrooms for their robust flavor, or a mix of varieties like white button and shiitake for added complexity. Chopping or slicing them finely ensures they blend smoothly into the soup, creating a rich umami base.
  • Garlic: Freshly minced garlic adds an indispensable aromatic depth to the mushroom soup. It complements the earthy mushrooms beautifully.
  • Broth: Use a good quality vegetable or chicken broth. Opt for low-sodium versions to control the seasoning of your soup. This liquid base will hydrate and carry the flavors.
  • Coconut Cream: This is our dairy-free secret weapon for achieving a rich, creamy consistency without any dairy. Make sure to use full-fat coconut cream (from a can, often separated from coconut milk) for the best results. It adds a subtle sweetness and luxurious mouthfeel without an overpowering coconut flavor.
  • Arrowroot Starch: This gluten-free thickener is key to achieving that perfectly velvety texture in the soup. It’s a natural alternative to traditional flour-based roux and provides a smooth, clear finish.
• For the French-Fried Onions:
  • Onions: White onions are ideal for their crisp texture and balanced flavor when fried. Slicing them uniformly and thinly is crucial for even cooking and optimal crispiness.
  • Coconut Milk: Used as a liquid binder for the flour coating, coconut milk helps the dry ingredients adhere to the onion slices.
  • Almond Flour, Arrowroot Starch, and Coconut Flour: This specific blend of gluten-free flours creates the perfect crispy coating for the onions. Almond flour provides a rich flavor, arrowroot starch ensures a light crispness, and coconut flour helps absorb moisture. I highly recommend sticking to this combination for the best results, as I haven’t tested other flour substitutions for the fried onions.
• Green Beans: Of course, you can’t have green bean casserole without the green beans! Fresh, vibrant green beans are always preferred for their superior texture and flavor. Buying them pre-trimmed can save a little time, but trimming them yourself is a straightforward task. They are the backbone of this comforting dish.

Substitutions and Modifications

While this recipe is carefully designed for optimal flavor and texture, here are a few potential adjustments you can make based on availability or personal preference:

• Arrowroot Starch: If you don’t have arrowroot starch on hand for the mushroom soup, tapioca starch is an excellent 1:1 substitute. Both are gluten-free and provide similar thickening properties.
• French Fried Onions: For a true shortcut, if making fried onions from scratch isn’t an option, you can create a crunchy topping using crushed gluten-free crackers. Toss them with a little melted butter or oil and a generous amount of onion powder before baking briefly until crisp. This won’t replicate the exact texture of homemade fried onions but will provide a savory crunch. You could also explore store-bought gluten-free fried onions, if available and compliant with your dietary needs.
• Mushrooms: Feel free to experiment with different mushroom varieties. Shiitake mushrooms will add a deeper, more intensely umami flavor, while cremini mushrooms offer a classic taste.
• Broth: While chicken broth provides a rich background, vegetable broth can be used for a completely vegetarian or vegan version of this casserole (ensure all other ingredients are plant-based).

Step-by-Step: How to Make Gluten-Free Green Bean Casserole without Canned Soup

Crafting this delicious casserole from scratch is easier than you think. Follow these simple steps, accompanied by photos, to achieve a perfect holiday side dish. Detailed instructions and measurements can be found in the complete recipe card below.

Step One: Prepare the Mushroom Base. In a medium stock pot, heat avocado oil over medium heat. Sauté the chopped mushrooms and minced garlic for 4-5 minutes until they are tender and fragrant. Stir in the arrowroot starch, ensuring the mushrooms are fully coated. This step is crucial for building the foundational flavor of your cream of mushroom soup.

Step Two: Simmer and Blend the Soup. Pour in the broth and coconut cream, mixing everything thoroughly to combine. Bring the mixture to a gentle simmer and let it cook for about 10 minutes, or until the soup noticeably thickens. Once thickened, remove from heat and allow it to cool slightly before blending until completely smooth using an immersion blender or a high-speed blender. Set this rich, creamy soup aside.

Step Three: Cook the Green Beans. Fill a large stock pot two-thirds full with water and bring it to a rolling boil. Add your trimmed green beans and cook for approximately 10 minutes, or until they are fork-tender but still retain a slight bite. Drain them well and set aside.

Step Four: Assemble and Bake the Casserole Base. Preheat your oven to 375°F (190°C). Lightly grease an 8×8 inch casserole dish. Add the cooked green beans to the dish, then pour the homemade cream of mushroom soup over them. Toss gently to ensure all green beans are evenly coated in the rich, creamy sauce. Bake in the preheated oven for 15-20 minutes.

Step Five: Prepare the Fried Onions. While the casserole bakes, prepare the fried onions. In a bowl, combine the arrowroot starch, almond flour, coconut flour, salt, and pepper to create your coating mixture. Set up a breading station with one bowl for the coconut milk and another for the flour mixture.

Step Six: Fry Onions and Finish Casserole. Heat a generous amount of avocado oil in a large deep skillet over medium-high heat. Dip each thinly sliced onion ring first into the coconut milk, then dredge it thoroughly in the flour mixture. Carefully drop the coated onions into the hot oil in small batches and fry for about 2 minutes per side, or until golden brown and crispy. Transfer the fried onions to a paper towel-lined plate to drain excess oil. Once the casserole is fully baked, top it generously with the freshly fried onions and serve immediately.

Expert Tips & Tricks for the Perfect Casserole

To ensure your gluten-free green bean casserole is a showstopper every time, consider these expert tips and tricks:

• Optimize Your Workflow: Holiday cooking can be hectic, but efficiency is key. To speed up the process, tackle the components simultaneously. While the green beans are steaming, begin sautéing the mushrooms for the soup. Once the casserole is in the oven, start frying the onions. This multi-tasking approach will significantly cut down on overall preparation time.
• Make It Your Own with Add-ins: Don’t be afraid to personalize your casserole! For a savory boost, consider adding cooked and crumbled bacon or pancetta to the green bean and mushroom mixture before baking. For an extra layer of flavor and texture, a sprinkle of fresh herbs like chopped parsley or chives before serving can brighten the dish. A pinch of cayenne pepper can also add a subtle kick if you enjoy a touch of heat.
• Achieve Peak Onion Crispiness: The key to truly crispy fried onions is to ensure they are coated evenly and fried in small batches. Overcrowding the pan will lower the oil temperature and lead to soggy onions. Fry them until they are a deep golden brown, then immediately transfer to a paper towel to absorb excess oil. You can even place them in a single layer on a baking sheet and keep them warm in a very low oven (around 200°F/90°C) while the rest of the components finish.
• Don’t Overcook the Green Beans: For the best texture, cook your green beans until they are tender-crisp. They will continue to cook slightly in the oven, so aiming for perfectly tender rather than mushy is important. If using fresh green beans, blanching them briefly in boiling water then shocking them in ice water can help retain their vibrant green color and firm texture.
• Prepping Ahead for Holiday Ease: The holiday season is busy, so anything you can do in advance helps. The cream of mushroom soup can be made up to 2-3 days ahead of time and stored in an airtight container in the refrigerator. The cooked green beans can also be prepared a day in advance. Combine the green beans and soup in the casserole dish, cover, and refrigerate. When ready to bake, let it come to room temperature for about 30 minutes before baking and making the fresh fried onions.

Storage and Reheating Instructions

Proper storage and reheating are essential to enjoy your delicious gluten-free green bean casserole even after the initial feast.

You can easily prepare the green bean casserole base (green beans mixed with the cream of mushroom soup) ahead of time. Store it covered in the refrigerator for up to 3 days. For the best taste and texture, it is always preferable to fry the onions fresh just before serving. If you have leftover fried onions, store them separately in an airtight container at room temperature to help maintain their crispiness; refrigerating them can make them soft.

To reheat the casserole, cover it loosely with foil and bake in the oven at 350°F (175°C) for approximately 15-20 minutes, or until thoroughly heated through and bubbling gently. If you are adding fresh fried onions, do so in the last 5 minutes of reheating. If reheating leftover fried onions, you can crisp them up in a dry skillet on the stovetop over medium heat for a few minutes or briefly in an air fryer.

Recipe FAQs

Other Related Gluten-Free Thanksgiving Recipes to Check Out…

Looking for more delicious and dietary-friendly dishes to complete your holiday spread? Explore these other fantastic gluten-free Thanksgiving recipes:

• Sweet Potato Casserole: A classic with a sweet and savory topping.
• Goat Cheese Mac & Cheese: A creamy, tangy twist on a beloved comfort food.
• Grain-Free “Corn”bread Stuffing: A flavorful and satisfying alternative to traditional stuffing.

If you tried this Gluten Free Green Bean Casserole or any other recipe on my blog, please consider leaving a 🌟 star rating and let me know how it went in the 📝 comments below. Your feedback helps others discover and enjoy these recipes! Thanks for visiting!

Gluten Free Green Bean Casserole

Yield: 8-9 servings

Prep Time: 20 mins

Cook Time: 45 mins

Author: Michelle

This gluten-free green bean casserole is the real deal! It’s made with homemade cream of mushroom soup and French-fried onions and is free of grains and dairy!

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Ingredients

For the Cream of Mushroom Soup

• 1 tbsp avocado oil
• 3 cups mushrooms, chopped or sliced
• 2 garlic cloves, minced
• 1 tsp dried thyme
• Salt and pepper to taste
• 1 tbsp arrowroot starch
• 1 ½ cup broth
• ⅓ cup coconut cream

For the Green Bean Casserole

• Prepared cream of mushroom soup (from above)
• 1 lb green beans, trimmed

For the Fried Onions

• 2 tbsp + 2 tsp arrowroot starch
• 1 tbsp + 1 tsp almond flour
• 1 tbsp coconut flour
• Salt and pepper to taste
• 1 white onion, halved and sliced thin
• ¼ cup coconut milk
• 3-4 tbsp avocado oil for frying

Instructions

For the Cream of Mushroom Soup

1. Using a medium stock pot, heat the avocado oil on medium heat. Sauté the mushrooms and garlic for 4-5 minutes or until tender. Add the arrowroot starch and stir to coat the mushrooms evenly.
2. Pour in the remainder of the soup ingredients (broth, coconut cream, thyme, salt, pepper), mix well to combine, and bring to a simmer for about 10 minutes or until the soup thickens to a creamy consistency.
3. Remove from heat and allow to cool slightly before using an immersion blender or high-speed blender to fully blend the soup until smooth. Set aside.

For the Green Bean Casserole

1. Fill a large stock pot about two-thirds of the way full with water and bring it to a boil. Add the trimmed green beans and cook for 10 minutes or until they are fork-tender. Strain the green beans well and set aside.
2. Preheat your oven to 375°F (190°C) and lightly grease an 8×8″ casserole dish. Add the cooked green beans to the casserole dish and pour the prepared mushroom soup over top. Toss gently to coat all the green beans.
3. Bake the casserole in the preheated oven for 15-20 minutes, allowing the flavors to meld and the casserole to heat through. While it bakes, simultaneously prepare the fried onions (see instructions below). Once the casserole is fully cooked and bubbly, top it generously with the freshly fried onions and serve immediately.

For the Fried Onions

1. Prepare the coating by combining the arrowroot starch, almond flour, coconut flour, salt, and pepper in a bowl. Mix thoroughly and set aside. Set up a breading station with one bowl for the coconut milk and another for the flour mixture.
2. Using a large deep skillet, heat a generous amount of avocado oil over medium-high heat. You’ll need enough oil to shallow-fry the onions.
3. Begin coating the onions by dipping a handful of thin slices into the coconut milk, allowing excess to drip off, then dredge them in the flour mixture, ensuring they are fully coated. Carefully drop the coated onions into the hot oil in small batches to avoid overcrowding the pan. Fry for about 2 minutes on each side, or until golden brown and wonderfully crispy.
4. Once fried, remove the onions with a slotted spoon and set them on a paper towel-lined plate to drain any excess oil. Repeat this process with the remaining onions, frying in 3-4 small batches until all are cooked. Add these crispy fried onions to the top of your baked green bean casserole just before serving.

Notes

To prep ahead of time, you can easily make the green bean casserole base (green beans mixed with the mushroom soup) a day or two in advance. Store it covered in the refrigerator. It’s always best to fry the onions fresh just before you plan to eat them to ensure maximum crispiness. If you must fry them ahead, store them separately from the casserole in an airtight container at room temperature to keep them from becoming soft.

Nutrition Information (Estimated Per Serving):

• Serving: 1 serving
• Calories: 239 kcal
• Carbohydrates: 13.2g
• Protein: 4.4g
• Fat: 19.1g
• Fiber: 4.2g

All nutrition facts are estimated and will vary depending on specific ingredients and preparation.

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This recipe was originally published in 2018 and has been updated with fresh content and enhanced details in 2024.

Photos by Modern Food Stories