If you are searching for a comforting, crowd-pleasing dish that combines fresh vegetables with indulgent flavors, this Cheesy Mushroom and Onion Green Bean Casserole Recipe is exactly what you need. This casserole perfectly balances the earthiness of mushrooms and the sweetness of caramelized onions with creamy mushroom soup and spicy pepper jack cheese, all topped with delightfully crispy fried onions for extra texture. Whether it’s a holiday favorite or a cozy weeknight side, this recipe brings warmth and savory goodness to your table with every bite.

Cheesy Mushroom and Onion Green Bean Casserole Recipe - Recipe Image

Ingredients You’ll Need

Putting together this Cheesy Mushroom and Onion Green Bean Casserole Recipe is a breeze when you have the right, simple ingredients on hand. Each plays a vital role in creating a harmony of flavors and textures—from the tender green beans and sautéed veggies to the creamy sauce and that irresistible crispy topping.

Condensed Cream of Mushroom Soup (2 cans, 10.5 oz each): Creates a luscious, creamy base that binds all the flavors together with a rich mushroom goodness.
Milk (1 cup): Lightens the soup mixture and helps create the perfect consistency for the casserole.
Ground Black Pepper (1/2 tsp): Adds just the right amount of warming spice to the filling.
Salt (1/2 tsp): Enhances the natural flavors throughout the dish.
Butter (1 tbsp): Provides richness and helps sauté the vegetables beautifully.
Olive Oil (1 tbsp): Keeps the vegetables from sticking and adds a subtle fruity note to the sauté.
Small Sweet Onion (1, thinly sliced): Brings a sweetness that gently balances the savory elements.
Mushrooms (1 cup, sliced): Adds earthiness and texture to the casserole’s heart.
Del Monte Green Beans (4 cans, 14.5 oz each, drained): The star vegetable, tender and ready to soak up all the wonderful flavors.
Pepper Jack Cheese (1 1/4 cups, shredded): Infuses a mild kick of spice and creamy meltiness.
French’s Crispy Fried Onions (2 2/3 cups): Offers that iconic golden crispness that elevates every bite.

How to Make Cheesy Mushroom and Onion Green Bean Casserole Recipe

Step 1: Prepare the Soup Mixture

Begin by combining the condensed cream of mushroom soups with milk, black pepper, and salt in a large bowl. Stir them gently until the mixture is smooth and beautifully merged. This forms the creamy, flavorful base that will bring all your ingredients together.

Step 2: Sauté the Vegetables

Warm the butter and olive oil in a sauté pan over medium heat. Add your thinly sliced sweet onions and mushrooms and cook, stirring occasionally, until they are softened and golden brown. This step unlocks their natural sweetness and deepens their flavor profile, which is essential for a rich casserole filling.

Step 3: Combine Ingredients

Add the drained green beans, along with the sautéed onions and mushrooms, to your prepared soup mixture. Stir everything gently but thoroughly so the green beans are evenly coated and the flavors meld perfectly together.

Step 4: Add Cheese

Fold in 1 cup of shredded pepper jack cheese into the mixture. This ingredient adds a creamy texture and a subtle spicy punch that makes the casserole pop with flavor.

Step 5: Assemble the Casserole

Transfer your combined mixture to a 3-quart casserole dish, spreading it out evenly. Leaving the dish uncovered at this stage ensures the top will bake nicely without getting soggy.

Step 6: Bake the Casserole

Place the casserole in a preheated oven at 350°F (175°C) and bake for 25 minutes. By the end of this period, the green bean mixture will be hot and bubbling, promising a cozy and satisfying bite.

Step 7: Add Toppings and Finish Baking

After the initial bake, gently stir the bean mixture. Then sprinkle the top with crispy fried onions and the remaining 1/4 cup of pepper jack cheese. Pop it back into the oven for an additional 5 minutes so the onions turn golden brown and everything melds together with a delightfully crispy, cheesy finish.

How to Serve Cheesy Mushroom and Onion Green Bean Casserole Recipe

Garnishes

To elevate your Cheesy Mushroom and Onion Green Bean Casserole Recipe, consider adding fresh herbs like chopped parsley or thyme right before serving. These bright green accents offer a lovely contrast to the rich flavors and add a fresh aroma to the dish.

Side Dishes

This casserole pairs wonderfully with roasted meats, such as turkey, chicken, or ham, making it a perfect addition to holiday spreads. For a vegetarian-friendly meal, serve it alongside a crisp salad or steamed rice to complement the creamy, cheesy texture.

Creative Ways to Present

For a modern twist, serve the casserole in individual ramekins or mini cast-iron skillets. This not only makes for a charming presentation but also ensures everyone gets a crispy top with each serving. You can also mix in a handful of toasted nuts like pecans just before serving for a delightful crunch.

Make Ahead and Storage

Storing Leftovers

Once cooled, transfer any leftovers to an airtight container and store them in the refrigerator for up to 3 days. The flavors actually deepen overnight, making it great for reheating the next day.

Freezing

You can freeze this casserole before baking to save time on busy days. Cover the assembled dish tightly with foil and then with plastic wrap to prevent freezer burn. It keeps well for up to 2 months. When ready, thaw it overnight in the refrigerator before baking.

Reheating

Reheat leftovers in a 350°F oven until warmed through, about 15 to 20 minutes, to maintain the casserole’s creamy texture and crispy topping. You can also microwave portions, but the oven method keeps that perfect crunchy finish intact.

FAQs

Can I use fresh green beans instead of canned?

Absolutely! You can blanch fresh green beans until tender-crisp before using them in the casserole. Just be sure to drain them well so your dish doesn’t become watery.

What cheese can I substitute for pepper jack?

Monterey Jack, cheddar, or even mozzarella work beautifully if you prefer a milder flavor. Just keep the cheese shredded for easy melting.

Can this recipe be made vegan or dairy-free?

Yes, by swapping out the cream of mushroom soup for a dairy-free version and using a plant-based cheese alternative, you can enjoy a vegan twist on this casserole. Use olive oil instead of butter for sautéing the vegetables.

How do I make the crispy fried onion topping from scratch?

Slice onions thinly and toss with a little flour and salt, then fry in hot oil until golden and crispy. Drain on paper towels before topping your casserole.

Is it possible to add other vegetables to this casserole?

Definitely! Diced bell peppers, carrots, or even peas can be stirred in to add different flavors and textures, making the casserole even more colorful and nutritious.

Final Thoughts

This Cheesy Mushroom and Onion Green Bean Casserole Recipe is truly a homey classic with a delicious twist that never fails to impress. With its perfect blend of creamy comfort and crunchy topping, it’s a dish you’ll return to again and again, whether for family dinners or festive occasions. Give it a try, and I promise it will quickly become one of your go-to favorites you’ll love sharing with everyone around your table.

Cheesy Mushroom and Onion Green Bean Casserole Recipe

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4.3 from 76 reviews

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

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Description

A comforting and flavorful Cheesy Mushroom and Onion Green Bean Casserole featuring tender green beans, sautéed sweet onions and mushrooms, creamy mushroom soup, and spicy pepper jack cheese, topped with crispy fried onions for a perfect holiday or family dinner side dish.

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