This classic holiday side dish is loaded with flavor and texture. You really couldn’t ask for more in this Easy Green Bean Casserole with crunchy green beans and savory baby bella mushrooms blanketed in cream of mushroom soup topped with crunchy fried onions.
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With a variety of flavors and textures, this easy green bean casserole is a must at your holiday table. No one will be able to resist the rich mushrooms and tender green beans in the velvety cream of mushroom soup. The crunchy fried onions add the finishing touch! So, if you’ve been searching for how to make green bean casseroles, this recipe is for you.
Using store-bought fried onions
If you’ve never cooked with store-bought fried onions before you’ll be pleasantly surprised at the flavor and texture they add to your dish. No need to go through the hassle of slicing and frying onions and dealing with the big greasy cleanup when you can pick up a container of pre-fried onions. They are great to have on hand to add to stews, casseroles, soups, or salads. This recipe calls for gluten-free fried onions so you can make a gluten free green bean casserole but if gluten is not a concern you can substitute with regular fried onions.
Why You’ll Love This Gluten-Free Green Bean Casserole Recipe
Classic: No holiday table is complete without a recipe for green bean casserole.
Hearty: Baby bella mushrooms give this casserole a hearty texture.
Comforting: Velvety cream of mushroom soup makes this dish rich and comforting.
Nostalgic: Reminiscent of the homemade green bean casserole recipes your mom prepared.
Simple: The easiest green bean casserole you’ll fine.
Yummy: One of the best green bean casserole recipes.
Ingredients For This Gluten Free Green Bean Casserole
- Fresh green beans – Fresh green beans, trimmed, are best but frozen will also work.
- Baby Bella mushrooms – Sliced baby bella mushrooms give this casserole some meatiness.
- Butter – Salted or unsalted butter both work.
- Cream of mushroom soup – To keep the recipe gluten free look for gluten-free soup. If gluten is not a concern regular cream of mushroom soup is fine.
- Fried onions – Look for gluten free onions if you want a gluten free casserole.
- Parmesan cheese – Use freshly grated parmesan for the best flavor.
- Onion – White, yellow or any type of onion, sliced, will work.
- Garlic – Freshly minced garlic is best but jarred is okay too.
- Salt and pepper – Add salt and pepper to taste.
- Fresh thyme – Fresh thyme adds a spicy and sweet flavor.
How To Make Green Beans Casserole Recipe
Step 1: Trim, rinse, and cook green beans in a steam basket. Remove from heat, rinse in cold water, and set aside.
Step 2: Melt butter in a large skillet and sauté mushroom and onions, along with fresh thyme until softened. Add garlic, season with salt and pepper, and sauté for 2 more minutes.
Step 3: Stir in the cream of mushroom soup and whisk to combine.
Step 4: Add the green beans and parmesan cheese and then season with salt and pepper.
Step 5: Transfer the green bean and mushroom mixture to a baking dish and add fresh thyme.
Step 6: Top green bean mixture with crispy fried onions.
Step 7: Bake at 350F degrees for 20 minutes. Serve hot.
Tips and Variations
Use a scissors to trim the green beans. To easily cut the green beans, hold them in your hand and use a scissors to cut the tops and bottoms.
Change up the mushrooms. If you can’t find baby bella mushrooms use portobella or cremini.
Instead of fried onions. Use panko breadcrumbs instead of fried onions, gluten free or not depending on your preference.
Try a different cheese. If parmesan cheese doesn’t appeal to you, use a different cheese, try gruyere, or if you only have cheddar on hand that’s fine too.
Fresh is always best but canned will work though your green beans will be a touch softer. Note frozen green beans are also an option.
Yes, if you opt to use canned green beans you should drain them beforehand.
You can always make a slurry or cornstarch and water to thicken up your green bean casserole. However, this casserole uses cream of mushroom soup which helps thicken it up.
Green bean casseroles should last up to 4 days in the fridge.
Make Ahead and Storage
If you want to get a few things off your to-do list you can make this casserole a few days ahead of time or prep the ingredients beforehand. You can steam the green beans and saute the mushrooms a few days before you want to cook the casserole and store them in the fridge. If you assemble the casserole, don’t add the fried onions until just before you want to bake the it so they stay nice and crispy.
Once assembled and cooked the casserole will keep for up to 4 days in the fridge. You can freeze leftovers, though the beans may lose their crispy texture, for up to 3 months. Thaw in the fridge overnight and reheat in the microwave or in the oven.
Other holiday recipes:
- Apple Sage Thanksgiving Stuffing
- Sausage and Apple Stuffed Honey Nut Squash
- Instant Pot Cranberry Sauce
- Maple Glazed Green Beans With Parmesan Panko
kitchen tools i used for this recipe
Easy Green Bean Casserole
- 1 1/2 lb fresh green beans trimmed
- 2 cups baby Bella mushrooms sliced
- 2 tbsp butter
- 1 can 14.5oz cream of mushroom soup gluten-free
- 3.5 oz fried onions gluten-free
- 1/2 cup grated parmesan cheese
- 1/2 onion sliced
- 3 cloves garlic minced
- salt and pepper to taste
- fresh thyme
- Trim and rinse green beans and cook in steam basket for 8 minutes or until tender. Remove from heat and rinse in cold water. Set aside
- Meanwhile melt butter in large skillet and sauté mushroom and onions, along with fresh thyme. Sauté for about 4-5 minutes until softened. Add garlic and season with salt and pepper. Sauté for 2 more minutes.
- Stir in can of cream of mushroom soup and whisk to combine.
- Transfer the green beans to the skillet, add parmesan cheese and season with salt and pepper. Mix well to coat green beans evenly.
- Transfer green bean and mushroom cream mixture to a baking dish. Add fresh thyme.
- Top green bean mixture with crispy fried onions.
- Bake at 350F degrees for 20 minutes. Serve hot.
Nutrition information is automatically calculated, so should only be used as an approximation.