Easy Gluten Free Green Bean Casserole From Scratch

If you grew up on classic green bean casserole made with canned soup and those iconic crispy onions, this gluten-free green bean casserole is about to change your holiday table forever. It has the same creamy, cozy, golden brown top you remember except we’re using fresh green beans amd real food ingredients that still delivers all the nostalgic flavor your taste buds crave.

Whether it’s Thanksgiving dinner, Christmas, or just a Sunday you want comfort food, this version is simple, delicious, and made without any gluten-filled shortcuts. There are also tips for making it low fodmap & easy to digest in the recipe card.

Green bean casserole is one of those holiday season dishes that only works when it tastes like the real thing. I wanted to create a version that tastes like the original recipe but feels lighter, fresher, and made with ingredients you can actually find at Whole Foods (or your favorite grocery stores!) without hunting for a dozen gluten-free substitutes.

This recipe keeps the cozy traditional vibes of the classic side dish, but instead of canned soup or canned green beans, we’re building flavor with fresh mushrooms, milk, broth, sage, and just a touch of tamari to round out the savory depth. It still gets bubbly in the casserole dish, the top gets perfectly golden brown, and the whole thing is shockingly easy. Bring this to a special occasion and watch even the extended family ask for the recipe!

You might also enjoy these other gluten free easy to digest side dishes, like these Truffle Mashed Potatoes , Homemade Cranberry Sauce or this Gluten Free Cornbread Stuffing, perfect for the Thanksgiving season.

Why You'll Love This Green Bean Casserole

• A healthier spin on the traditional green bean casserole using whole food ingredients that still gives you the same creamy sauce, crisp-tender fresh green beans, and nostalgic flavor of the original recipe without relying on canned soup.
• Made with fresh ingredients and real food, including blanched green beans, fresh mushrooms, and a gluten-free substitute for the classic creamy mushroom soup, so the whole thing tastes like the real thing but feels lighter.
• Finished with a golden brown, crispy topping thanks to gluten-free panko crumbs or homemade fried onions, giving this gluten-free version the best part of every classic side dish you grew up loving.
• Flexible to accommodate different dietary restrictions. ​This easy gluten free green bean casserole can be customized to be low fodmap friendly, dairy free or vegan/vegetarian friendly if needed with just a few swaps.

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Gluten Free Green Bean Casserole Ingredients & Tested Substitutions

• Fresh green beans. Fresh green beans give this dish the most crisp tender texture. Blanching keeps them vibrant.
• Oyster mushrooms or white button mushrooms. Totally optional but add depth and replicate that creamy mushroom soup vibe without the canned stuff.
• Broth. Chicken broth or veggie broth both work. Adds richness to the green bean mixture. If you need easy to digest, try these low fodmap broths from Gourmend Foods and use my code PDL15 for 15% off.
• Milk. You can use dairy, lactose free or non-dairy milk for this recipe.
• Garlic powder or garlic-infused olive oil. Use infused oils if you want it more gut-friendly.
• Shallots. You can swap these for infused olive oil if you need a low fodmap version. 
• Fresh sage. It's preferable to use fresh but if you only have dried, ground sage that will work as well.
• Parmesan cheese/ Helps create that bubbly, golden brown top. Swap for dairy-free parm if needed.
• Gluten-free panko crumbs. Panko crumbs give crunch without using potato chips or canned crispy fried onions.
• Tamari soy sauce. Just a splash makes the whole thing taste deeper and more savory. You can also use coconut aminos instead.
• Crushed pecans or almonds. Adds crunch and makes the topping feel special.
• Butter or dairy-free butter. For richness and sautéing.
• Arrowroot powder or gluten-free flour (optional). If you want the sauce thicker, whisk in 1 teaspoon.

Expert Tips & Tricks

• For extra crunch: Add a handful of gluten-free crispy fried onions on top during the last 5 minutes of baking.
• To thicken the sauce: Whisk 1 teaspoon arrowroot powder or gluten-free flour into the broth before adding beans.
• To prep ahead: Assemble everything except the topping. Cover with plastic wrap or aluminum foil, refrigerate, then bake the next day.

Gluten Free Green Bean Casserole Step by Step Instructions

1. Prep. Preheat oven to 375°F. Grease a small casserole dish with olive oil spray.

2. Saute mushrooms. Heat butter in a large skillet over medium-high heat. Add mushrooms (if using) and sauté 3 to 4 minutes until softened. Stir in garlic powder or garlic-infused oil and shallots or shallot-infused oil.

3. Pour in chicken broth and milk. Stir and bring to a gentle simmer. Add chopped sage, tamari, salt, and pepper. Simmer 1 to 2 minutes. Whisk in flour.

4. Add the fresh green beans to the casserole dish and pour the mushroom broth mixture over top, tossing to fully coat.

5. Top. Sprinkle with Parmesan cheese and gluten-free panko crumbs.

6. Bake. Bake for 30-35 minutes, or until the top is golden brown and bubbling around the edges.

7. Garnish. Garnish with crushed pecans or almonds before serving if desired.

Storage & Make Ahead Tips

This gluten-free green bean casserole stores beautifully, making it perfect for busy holiday cooking. Once cooled, transfer leftovers to an airtight container and refrigerate for up to 4 days. Reheat in a 350°F oven for 10 to 12 minutes to keep the topping crisp; avoid microwaving if you want to maintain crunch.

To make it ahead, assemble the casserole without the panko topping, cover tightly with plastic wrap or foil, and refrigerate for up to 48 hours. When ready to bake, add the topping and bake as directed. You can also prep the sauce and green beans separately up to 3 days in advance.

Gluten Free Green Bean Casserole FAQs

Can I make this dairy-free?

Yes! Use dairy-free butter and dairy-free parmesan. Everything else stays the same.

Should I use fresh or frozen green beans?

Fresh green beans work best for this dish, however if you can only find frozen those will work too, you may just end up with a little extra liquid to leave behind before you've put the casserole in the oven. Canned green beans will make it softer and more like the original recipe, but reduce cooking time by 5 minutes.

Where do I find infused olive oil?

I get both garlic infused olive oil and shallot infused olive oil from Fody Foods. You can find them in most grocery stores like Whole Foods or online through Amazon.

What to serve with gluten free green bean casserole

• Gluten Free Cornbread Stuffing
• Truffle Mashed Potatoes
• Homemade Cranberry Sauce
• Fall Kale Salad
• Festive Cranberry Mocktail
• Holiday Antipasto Wreath

Did you have a chance to make this recipe? If so, please leave me a 5 star rating & a review below. I always love and appreciate hearing from you!