If you are craving a classic comfort food with a delightful twist, then this Cheesy Mushroom and Onion Green Bean Casserole Recipe is exactly what you need. It masterfully combines tender green beans, savory sautéed mushrooms and onions, and a luscious creamy soup base, all elevated by the spicy, melty goodness of pepper jack cheese and the irresistible crunch of crispy fried onions. This dish is a crowd-pleaser perfect for family dinners or holiday gatherings, delivering warm, cheesy, and satisfying flavors in every bite.

Cheesy Mushroom and Onion Green Bean Casserole Recipe - Recipe Image

Ingredients You’ll Need

Every ingredient in this Cheesy Mushroom and Onion Green Bean Casserole Recipe plays a starring role, from the creamy soup mixture to the layers of cheese and crunchy toppings. The balance of textures and flavors comes together effortlessly with accessible ingredients, making this recipe both simple and truly special.

Campbell’s® Condensed Cream of Mushroom Soup (2 cans, 10.5 oz. each): Provides the rich and creamy base that binds the casserole.
Milk (1 cup): Lightens the soup mixture for a silky smooth texture.
Ground black pepper (1/2 tsp): Adds a subtle kick to highlight the savory notes.
Salt (1/2 tsp): Enhances all the natural flavors perfectly.
Butter (1 tbsp): For sautéing vegetables with a rich, buttery finish.
Olive oil (1 tbsp): Balances the butter and helps soften the onions and mushrooms.
Sweet onion (1 small, thinly sliced): Brings natural sweetness and depth to the casserole.
Mushrooms (1 cup, sliced): Earthy, tender, and flavorful for umami richness.
Del Monte® Green Beans (4 cans, 14.5 oz. each, drained): The star vegetable, providing freshness and vibrant color.
Pepper jack cheese (1 1/4 cups shredded, divided): Adds creamy, spicy gooeyness mixed in and sprinkled on top.
French’s® Crispy Fried Onions (2 2/3 cups): Delivers that signature golden crunch to crown the casserole.

How to Make Cheesy Mushroom and Onion Green Bean Casserole Recipe

Step 1: Prepare the Soup Mixture

Start by combining your condensed cream of mushroom soup, milk, black pepper, and salt in a large bowl. Stir these together until you have a smooth, creamy mixture. This base will hold all the flavors together and create that comforting sauce you love in a green bean casserole.

Step 2: Sauté the Vegetables

Heat the butter and olive oil in a sauté pan over medium heat. Once shimmering, add the thinly sliced sweet onion and mushrooms. Cook them, stirring occasionally, until they turn soft and just start to caramelize into a lovely golden brown. This step really intensifies the flavor and adds a beautiful aroma to your casserole.

Step 3: Combine Ingredients

Drain the green beans well, then add them to the bowl with the soup mixture. Fold in the sautéed onions and mushrooms. Stir gently until every green bean is generously coated with that creamy mushroom mixture. It’s already starting to look and smell amazing!

Step 4: Add Cheese

Next, fold in 1 cup of shredded pepper jack cheese into the mix. This cheese does more than just melt; it adds a subtle spicy warmth that sets this recipe apart from the ordinary.

Step 5: Assemble the Casserole

Transfer everything to a 3-quart casserole dish, spreading the mixture out evenly so it bakes uniformly. At this stage, the anticipation builds because you’re moments away from that bubbling, cheesy goodness.

Step 6: Bake the Casserole

Pop the casserole into a preheated oven at 350°F (175°C) and bake uncovered for 25 minutes. This allows the bean mixture to heat through and the flavors to meld beautifully.

Step 7: Add Toppings and Finish Baking

After the initial bake, gently stir the casserole. Then sprinkle it with the crispy fried onions and the remaining 1/4 cup of pepper jack cheese. Return it to the oven for an additional 5 minutes to toast the onions to a perfect golden brown and melt the topping cheese into a dreamy, crunchy finish.

How to Serve Cheesy Mushroom and Onion Green Bean Casserole Recipe

Garnishes

For an extra touch, sprinkle some fresh chopped parsley or chives on top right before serving. The green herbs add a pop of color and a fresh contrast to the rich, cheesy casserole, making it look as good as it tastes.

Side Dishes

This casserole pairs wonderfully with roasted meats like turkey, chicken, or ham, especially during festive dinners. It also complements simple sides such as mashed potatoes or a crisp garden salad, balancing richness with fresh, light elements on your plate.

Creative Ways to Present

Serve the casserole in individual ramekins for a personalized touch, or try layering it in a clear glass dish to show off the colorful layers of green beans, mushrooms, cheese, and crispy onions. It’s a showstopping dish that’s as pretty as it is tasty.

Make Ahead and Storage

Storing Leftovers

If you have any leftovers (and you might!), store them in an airtight container in the refrigerator for up to 3 days. The casserole flavors deepen overnight, making it just as delicious the next day.

Freezing

You can freeze this casserole before the final baking step. Cover tightly with foil or plastic wrap and freeze for up to 2 months. When ready, thaw overnight in the fridge and bake as directed, adding the crispy onion topping just before the last 5 minutes of baking.

Reheating

Reheat leftover casserole in the oven at 350°F (175°C) until hot and bubbly, about 15–20 minutes. Avoid the microwave if you want to keep the topping crispy. If needed, add a handful of fresh fried onions before reheating to refresh the crunch.

FAQs

Can I use fresh green beans instead of canned?

Absolutely! Fresh green beans can add a lovely crispness. Just blanch them in boiling water for 3–4 minutes before adding them to the casserole to ensure they cook through properly during baking.

Can I substitute the pepper jack cheese?

Yes, you can swap pepper jack for cheddar or Monterey Jack if you prefer less spice. Each cheese will lend its own delicious character to the dish.

Is this casserole gluten-free?

Traditional crispy fried onions contain wheat, so the casserole isn’t gluten-free as is. To make a gluten-free version, you can find gluten-free fried onions or make your own crispy topping using gluten-free breadcrumbs or crushed gluten-free crackers.

How spicy is this casserole?

The pepper jack cheese gives a mild, pleasant heat that enhances flavor without overpowering. If you’re sensitive to spice, reducing the cheese or substituting a milder kind will make it more gentle.

Can I prepare this dish entirely ahead of time?

You sure can! Prepare the whole casserole up to the point of baking, cover it tightly, and refrigerate for up to 24 hours. Then bake as instructed when you’re ready to serve for fresh, warm goodness.

Final Thoughts

This Cheesy Mushroom and Onion Green Bean Casserole Recipe is one of those dishes that feels like a warm hug on a plate. It’s bursting with flavor, texture, and comfort that invites everyone to the table with a smile. Whether you’re making it for a special occasion or a cozy weeknight dinner, I encourage you to give it a try—trust me, it’ll become a favorite in your recipe collection just like it has in mine!

Cheesy Mushroom and Onion Green Bean Casserole Recipe

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3.9 from 43 reviews

Author: admin
Total Time: 40 minutes
Yield: 12 servings 1x

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Description

This Cheesy Mushroom and Onion Green Bean Casserole is a deliciously creamy and savory dish perfect for gatherings or family dinners. Featuring tender green beans mixed with a rich cream of mushroom soup base, sautéed sweet onions and mushrooms, and melted pepper jack cheese, it’s topped with crispy fried onions for the perfect crunchy finish. Baked to bubbling perfection, this casserole combines classic comfort flavors with a zesty twist from the pepper jack cheese.

Ingredients

Scale

Soup Mixture

2 cans (10.5 oz each) Campbell’s® Condensed Cream of Mushroom Soup
1 cup milk
1/2 tsp ground black pepper
1/2 tsp salt

Sautéed Vegetables

1 tbsp butter
1 tbsp olive oil
1 small sweet onion, thinly sliced
1 cup mushrooms, sliced

Main Mix-ins

4 cans (14.5 oz each) any style Del Monte® Green Beans, drained

Cheese & Topping

1 1/4 cups shredded pepper jack cheese, divided
2 2/3 cups French’s® Crispy Fried Onions

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Instructions

Prepare the Soup Mixture: In a large bowl, combine the condensed cream of mushroom soup, milk, ground black pepper, and salt. Stir well until the mixture is smooth and all the ingredients are evenly incorporated.
Sauté the Vegetables: Heat the butter and olive oil in a sauté pan over medium heat. When hot, add the thinly sliced sweet onion and mushrooms. Cook, stirring occasionally, until the vegetables are soft and golden brown. Remove from heat.
Combine Ingredients: Add the drained green beans and the sautéed onion and mushroom mixture to the bowl with the soup mixture. Stir thoroughly until all ingredients are well coated.
Add Cheese: Fold in 1 cup of the shredded pepper jack cheese into the mixture, mixing well until evenly distributed.
Assemble the Casserole: Transfer the combined mixture into a 3-quart casserole dish. Spread it out evenly and leave it uncovered.
Bake the Casserole: Preheat the oven to 350°F (175°C). Place the casserole dish in the oven and bake for 25 minutes, or until the mixture is hot and bubbling.
Add Toppings and Finish Baking: Remove the casserole, gently stir the mixture, then evenly sprinkle the top with the crispy fried onions and the remaining 1/4 cup of shredded pepper jack cheese. Return the casserole to the oven and bake for an additional 5 minutes, or until the fried onions are golden brown and crispy.

Notes

Use fresh green beans instead of canned for a firmer texture, adjusting cooking time accordingly.
For a spicier kick, substitute pepper jack cheese with jalapeño cheddar cheese.
Make this casserole ahead of time and refrigerate before baking; just add a few extra minutes to the baking time if baking from cold.
To make this dish gluten-free, ensure the crispy fried onions are gluten-free or substitute with gluten-free breadcrumbs.
Let the casserole rest for 5 minutes after baking to allow the cheese to set before serving.

Prep Time: 10 minutes
Cook Time: 30 minutes
Category: Casserole
Method: Baking
Cuisine: American