Gluten Free Green Bean Casserole

This Gluten-Free Green Bean Casserole tastes just like the classic one you grew up with: creamy mushroom sauce, tender green beans, and crispy fried onions on top. Nobody at the table will know it’s gluten-free! It’s ready in 35 minutes with a handful of ingredients, and you can make it ahead for Thanksgiving.

The sauce is the easy part. Grab a gluten-free condensed cream of mushroom soup, or make my homemade gluten-free cream of mushroom soup from scratch. For the topping, French’s Crispy Fried Onions are made with wheat flour, so they’re out. I make my own crispy onion strings with gluten-free all-purpose flour, and they’re even better than the can. Plus, you can make my air-fried version too.

Table of contents

• What is Gluten-Free Green Bean Casserole?
• Why You’ll Love This Recipe
• Ingredient Notes
• How to Make Gluten-Free Green Bean Casserole
• Tips for the Best Green Bean Casserole
• Variations of Green Bean Casserole
• Frequently Asked Questions
• What to Serve with Gluten-Free Green Bean Casserole
• Storage Tips
• More Thanksgiving Recipes

What is Gluten-Free Green Bean Casserole?

Gluten-free green bean casserole is a classic holiday side made with green beans, gluten-free cream of mushroom soup, milk, and crispy gluten-free fried onions, baked until hot and bubbly. It tastes just like the traditional recipe. The only change is swapping out the two ingredients that usually contain wheat: the canned soup and the French’s fried onions.

Why You’ll Love This Recipe

• Tastes like the classic. Nobody will guess it’s gluten-free.
• Only one bowl to wash. Mix everything in the bowl, then pour it into the dish.
• Pantry ingredients. Canned green beans, soup, and milk are easy to keep on hand.
• Holiday-friendly. Make it ahead and bake it while the turkey rests.
• Safe for everyone. Gluten-free guests don’t have to skip the casserole.
• Kid-approved. Crispy onions on top win over even picky eaters.

Ingredient Notes

• Gluten-free cream of mushroom soup: The creamy base. Most regular canned cream soups are thickened with wheat flour, so use a brand labeled gluten-free (Pacific Foods makes one) or my homemade version.
• Milk: Thins the condensed soup into a smooth, pourable sauce. Any milk works.
• Green beans: Canned sliced green beans are the classic choice and the easiest. Drain them well!
• Gluten-free fried onions: The crunchy topping. French’s Crispy Fried Onions contain wheat, so use homemade onion strings made with gluten-free flour or a brand clearly labeled gluten-free.
• Salt and pepper: Season lightly and taste first, since canned soup and beans already have salt.

How to Make Gluten-Free Green Bean Casserole

1. Preheat the oven. Heat to 350°F and spray a 2-quart casserole dish with nonstick spray.
2. Mix the filling. In a large bowl, stir together the soup, milk, drained green beans, salt, and pepper until the beans are evenly coated.
3. Fold in some onions. Gently stir in ⅔ cup of the fried onions for flavor.
4. Bake. Spread the mixture in the dish and bake for 25 minutes, until hot and bubbling around the edges.
5. Top and finish. Sprinkle the remaining onions on top and bake 5 more minutes, until golden and crispy.

Tips for the Best Green Bean Casserole

• Dry the green beans well. Extra liquid is the number one cause of a watery casserole. Drain them, then pat them dry.
• Save the onions for the end. Adding most of the topping in the last 5 minutes keeps it crunchy instead of soggy or burnt.
• Blanch fresh green beans first. If you use fresh beans, boil them for 4–5 minutes, so they’re tender in the casserole.
• Doubling it? Use a 9×13 dish and bake 35–40 minutes before adding the topping.
• Read every label. Check the soup, the onions, and the broth if you make homemade soup. Hidden wheat is common in all three.
• Make it richer. A splash of heavy cream in place of some of the milk makes the sauce extra creamy.

Variations of Green Bean Casserole

• Cheesy: Stir in ½ cup shredded cheddar or Parmesan.
• Bacon: Add 4–6 slices of crumbled cooked bacon to the filling.
• Fresh mushrooms: Sauté 8 oz sliced mushrooms and stir them in for extra mushroom flavor.
• Frozen green beans: Thaw completely and drain well before mixing.
• Different soup: Gluten-free cream of chicken soup works if you’re not a mushroom fan.
• Dairy-free: Use a dairy-free cream of mushroom soup and unsweetened plain almond or oat milk.

Frequently Asked Questions

Traditional green bean casserole isn’t gluten-free. Both the canned cream of mushroom soup and French’s fried onions contain wheat flour. Using a gluten-free soup and gluten-free fried onions makes it fully gluten-free.

No, French’s Crispy Fried Onions are made with wheat flour. Make homemade onion strings with gluten-free flour, or buy a brand that’s clearly labeled gluten-free.

Yes! Assemble it without the topping, cover, and refrigerate for up to 2 days. Add about 10 minutes to the bake time and put the onions on at the end.

Yes. Trim and blanch fresh green beans in boiling water for 4–5 minutes, then drain well before mixing them in.

You can freeze it without the topping for up to 2 months. Thaw it overnight in the fridge, bake as directed, and add fresh onions at the end.

Add most of the onions during the last 5 minutes of baking. Reheat leftovers in the oven instead of the microwave.

What to Serve with Gluten-Free Green Bean Casserole

Brown Sugar Slow Cooker Ham (Gluten-Free)

Gluten-Free Refrigerated Mashed Potatoes (Make Ahead)

Gluten-Free Maple Pecan Sweet Potato Casserole

Homemade Cranberry Sauce (Gluten-Free)

Vintage Betty Crocker Gluten-Free Scalloped Potatoes

Easy Classic Gluten-Free Pumpkin Pie for dessert!

Storage Tips

• Fridge: Store leftovers covered for 3–4 days.
• Freezer: Freeze without the onion topping for up to 2 months. Thaw overnight in the fridge before baking.
• Reheating: Warm in a 350°F oven for 10–15 minutes so the topping crisps back up. The microwave works for a single serving, but the onions will soften.

This gluten-free green bean casserole is easy, make-ahead friendly, and tastes just like the one you grew up with. Add it to your Thanksgiving menu this year! For more ideas, check out my Best 20 Thanksgiving Recipes for a Traditional Holiday Meal.

More Thanksgiving Recipes

• Pecan Cream Cake (Gluten-Free Optional)

• Brown Sugar Slow Cooker Ham (Gluten-Free)

• Slow Cooker Green Beans and Potatoes with Bacon

• Easy Gluten-Free Pressure Cooker Pumpkin Cheesecake