As a seasoned gluten-free cook, let me teach you how to make gluten-free green bean casserole, from scratch. This side dish rivals the old fashioned, classic green bean casserole you grew up on, but no one will realize it’s gluten-free. My version of this recipe skips canned soup and instead features a quick-to-make gluten-free substitute for cream of mushroom soup. Top the dish with homemade gluten-free fried onions and bake until bubbling.
Melt the butter in a medium saucepan over medium high heat. Add the mushrooms, cooking and stirring until they are soft and the liquid has evaporated, about 6-7 minutes. Add the garlic, salt, pepper, onion powder and saute for 30 seconds longer.
3 tablespoons unsalted butter, 8 ounce white button mushrooms, 2 cloves garlic, ½ teaspoon salt, ⅛ teaspoon pepper, ½ teaspoon onion powder
Whisk together chicken broth with the cornstarch. Add to the mushrooms and cook, stirring continuously until very thick, about 1 minute.
1 cup chicken broth, 4 tablespoons cornstarch
Stir in ½ cup milk and cook and stir one minute longer. Set aside until ready to mix in casserole.
½ cup milk
Gluten-Free Green Bean Casserole
If the french fried onions have not been prepared yet, complete this step first. Set aside until ready to use.
1 recipe gluten-free french fried onions
Preheat the oven to 350°F. If using fresh or frozen green beans, cook until just crisp tender. Drain and set aside.
1 pound fresh or frozen green beans
In a large bowl mix together the condensed mushroom soup, green beans, optional cheese, ½ cup milk, ½ cup fried onions, soy sauce, seasoned salt, and pepper. Stir gently to combine.
1 cup freshly grated sharp cheddar cheese, ½ cup milk, 1 teaspoon gluten-free soy sauce, ¼ teaspoon seasoned salt, ⅛ teaspoon ground pepper
Spread the green bean mixture in a 2 quart baking dish. Add the remaining fried onions on top. Bake for 30-40 minutes, or until the casserole is hot and bubbly throughout.
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Notes
dairy-free adaptations
Make the mushroom soup using non-dairy milk and vegan butter.If using the homemade french fried onions, these may also be prepared using a non-dairy milk.When mixing together the casserole, replace the milk with a dairy-free version and omit the cheddar cheese.
storing / reheating tips
If you have leftovers, be sure the casserole has cooled completely before storing. Transfer to an airtight storage container and refrigerate up to three days.Reheat serving-size portions in the microwave at 50% until almost heated through, gently stirring occasionally. Finish by heating at full power until hot.
Using Store-Bought Gluten-Free Soup
You may use it, but it may adversely affect the taste and consistency. Finding a condensed, ready-made mushroom soup is hard to come by. The dump and heat versions are thinner and not as concentrated with flavor.For a canned soup, I recommend holding off adding any extra milk to the recipe.Stir everything together and add milk if the green bean mixture needs to be thinner.