Cheesy Mushroom Rice Casserole is a comforting side dish that combines creamy cheese, tender mushrooms, and fluffy rice for a rich, hearty meal that’s perfect for any occasion. Whether you’re serving it alongside roasted chicken, beef, or just enjoying it as a vegetarian main dish, this casserole is sure to be a family favorite. The blend of mushrooms and cheese creates a deeply satisfying flavor that makes this dish a true comfort food classic.

Table of Contents

• Ingredients
• Instructions
• Cooking Notes
• Variations
• Frequently Asked Questions (FAQs)
• Conclusion

Ingredients

• 1 cup long-grain white rice
• 2 cups chicken or vegetable broth
• 1 tablespoon unsalted butter
• 1 tablespoon olive oil
• 1 medium onion, diced
• 3 cloves garlic, minced
• 10 oz baby bella or white mushrooms, sliced
• 1 teaspoon dried thyme
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1/2 cup heavy cream
• 1 1/2 cups shredded cheddar cheese
• 1/2 cup grated Parmesan cheese
• 1/4 cup chopped fresh parsley (optional, for garnish)

Instructions

Step 1: Cook the Rice

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with nonstick cooking spray or butter.
2. In a medium saucepan, bring the chicken or vegetable broth to a boil. Add the rice, reduce the heat to low, cover, and simmer for 15-18 minutes, or until the rice is tender and the liquid is absorbed.
3. Fluff the rice with a fork and set aside.

Step 2: Cook the Vegetables

1. In a large skillet, heat the olive oil and butter over medium heat. Add the diced onion and sauté for 4-5 minutes, or until softened and translucent.
2. Add the minced garlic and sliced mushrooms, cooking for an additional 6-8 minutes until the mushrooms are tender and browned.
3. Stir in the dried thyme, salt, and black pepper, cooking for 1-2 more minutes until the spices are fragrant.

Step 3: Assemble the Casserole

1. In a large mixing bowl, combine the cooked rice, mushroom mixture, heavy cream, 1 cup of shredded cheddar cheese, and 1/4 cup of grated Parmesan cheese.
2. Mix until well combined, then transfer the mixture to the prepared baking dish.
3. Top with the remaining 1/2 cup of shredded cheddar cheese and the remaining 1/4 cup of grated Parmesan cheese.

Step 4: Bake

1. Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes.
2. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.

Step 5: Garnish and Serve

1. Remove the casserole from the oven and let it rest for 5 minutes before serving.
2. Garnish with chopped fresh parsley if desired, and serve warm.

Cooking Notes

• Broth: For a vegetarian version, use vegetable broth instead of chicken broth.
• Cheese: Cheddar cheese provides a classic cheesy flavor, but you can substitute it with mozzarella for a milder taste or Gruyère for a more complex flavor.
• Mushrooms: Baby bella mushrooms add depth to the dish, but you can also use white button mushrooms or a mix of your favorite mushrooms for added variety.

Variations

Broccoli Cheesy Mushroom Rice Casserole

• Add 1 cup of chopped broccoli florets to the mushroom mixture for added color, flavor, and nutrients.

Spicy Cheesy Mushroom Rice Casserole

• Stir in 1/4 teaspoon of cayenne pepper or red pepper flakes for a little heat to balance the creaminess of the dish.

Bacon Cheesy Mushroom Rice Casserole

• Cook 4-5 slices of bacon until crispy, crumble them, and mix them into the rice and mushroom mixture for a smoky, savory addition.

Frequently Asked Questions (FAQs)

Can I Make This Casserole Ahead of Time?

Yes! You can assemble the casserole up to a day in advance and store it in the refrigerator until ready to bake. When baking, add an extra 5-10 minutes to the covered baking time if the casserole is cold from the fridge.

How Should I Store Leftovers?

Store any leftover casserole in an airtight container in the refrigerator for up to 3 days. Reheat in the oven at 350°F (175°C) until warmed through, or in the microwave for a quicker option.

Can I Freeze This Casserole?

Yes, this casserole can be frozen. Let it cool completely, then wrap it tightly in aluminum foil and place it in a freezer-safe bag or container. Freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

Cheesy Mushroom Rice Casserole is a comforting, flavorful dish that pairs well with just about any main course. The rich, creamy combination of cheese, mushrooms, and rice makes it a satisfying and versatile side dish for family dinners or holiday gatherings. Feel free to experiment with variations to make it your own—whether you add veggies, spice, or even a smoky touch, this casserole will always deliver on flavor and comfort.

Happy cooking, and enjoy every cheesy, savory bite of this Cheesy Mushroom Rice Casserole!