The Ultimate Cream of Mushroom Rice Casserole: Comfort Food at Its Finest

Craving the ultimate comfort classic? This Cream of Mushroom Rice Casserole recipe delivers a rich, savory, and creamy experience perfect for weeknight dinners or holiday potlucks. It’s simple to assemble, requiring minimal hands-on time, yet yields incredibly satisfying results that everyone at the table will adore.

Why You Will Love This Recipe

This Cream of Mushroom Rice Casserole is the definition of easy elegance. It’s incredibly budget-friendly, utilizing pantry staples to create a deeply flavorful dish. The combination of tender rice, earthy mushrooms, and a velvety cream sauce makes it a true crowd-pleaser. Best of all, it’s wonderfully versatile, pairing well with almost any main course, or serving as a hearty vegetarian centerpiece on its own.

Ingredients

• 1 cup long-grain white rice, uncooked
• 1 (10.5 ounce) can condensed cream of mushroom soup
• 1 cup milk (whole or 2%)
• 1/2 cup chicken or vegetable broth
• 1/2 cup finely chopped onion
• 1 tablespoon butter
• 8 ounces fresh mushrooms, sliced (cremini or white button)
• 1/2 teaspoon garlic powder
• 1/4 teaspoon black pepper
• 1/4 teaspoon salt (adjust to taste, depending on broth salinity)
• 1 cup shredded sharp cheddar cheese (optional, for topping)

Step-by-Step Instructions

1. Preheat your oven to 375 degrees F (190 degrees C). Lightly grease an 8×8 inch or similar sized baking dish.
2. Cook the rice according to package directions until it is just tender (al dente). Set aside.
3. While the rice is cooking, sauté the aromatics. Melt the butter in a large skillet over medium heat. Add the chopped onion and cook until softened and translucent, about 3-4 minutes.
4. Add the sliced mushrooms to the skillet. Cook until the mushrooms have released their moisture and started to brown lightly, about 5-7 minutes.
5. In a separate bowl, whisk together the condensed cream of mushroom soup, milk, and broth until smooth. Stir in the garlic powder, salt, and pepper.
6. Combine the cooked rice, the mushroom and onion mixture, and the cream sauce mixture gently in a large mixing bowl. Ensure everything is evenly distributed.
7. Pour the mixture into the prepared baking dish, spreading it into an even layer.
8. Bake uncovered for 25 minutes.
9. If using, sprinkle the shredded cheddar cheese evenly over the top during the last 5 minutes of baking, or until the cheese is melted and lightly golden brown.
10. Let the casserole rest for 5-10 minutes before serving.

Expert Tips / Pro Tips

• Do not overcook the rice initially. Since it will continue to cook in the oven, slightly undercooked rice results in a better final texture that is creamy, not mushy.
• For deeper mushroom flavor, skip the fresh mushrooms and use 1/2 cup of dried porcini mushrooms (soaked, squeezed dry, and chopped). Use the soaking liquid (strained) in place of some of the broth.
• Use low-sodium broth if you are concerned about salt intake, as the condensed soup already contains a significant amount. Taste before adding extra salt.
• To achieve a crispy topping without cheese, mix 1/2 cup of Panko breadcrumbs with 1 tablespoon of melted butter and sprinkle over the casserole before the final 10 minutes of baking.

Variations & Substitutions

• Greens Boost: Stir in 2 cups of fresh or frozen spinach (thawed and drained well) along with the rice mixture for added nutrition and color.
• Protein Power: Fold in 1 cup of shredded rotisserie chicken or cooked diced ham for a heartier meal.
• Herb Enhancement: Add 1 teaspoon of dried thyme or a tablespoon of fresh chopped parsley (added after baking) for an herby lift.
• Gluten-Free Option: Ensure your condensed soup is certified gluten-free, and use gluten-free rice.
• Dairy-Free Alternative: Substitute the milk with unsweetened cashew or almond milk, and use a dairy-free cream of mushroom soup alternative (or homemade cashew cream base).

Serving Suggestions

This rich casserole pairs beautifully with lighter, fresh sides to balance the creamy texture. Consider serving it alongside a crisp, acidic green salad tossed with a vinaigrette dressing. Roasted asparagus or simple steamed green beans provide a perfect vegetable complement. For a full comfort meal, pair it with simple baked chicken breasts or slow-cooked pot roast.

Storage, Freezing & Reheating

Storage: Store leftover Cream of Mushroom Rice Casserole in an airtight container in the refrigerator for up to 3-4 days. It tends to firm up considerably when chilled.

Freezing: This casserole freezes well. Cool completely before transferring to a freezer-safe, airtight container. It can be frozen for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheating: To reheat, place the desired portion in a microwave-safe dish covered loosely with a paper towel, heating until warmed through (about 1-2 minutes per serving). For larger portions baked in the oven, cover with foil and bake at 350 degrees F (175 degrees C) for 20-25 minutes, adding a splash of milk or broth if it seems too dry.

Nutrition Information

Note: Nutrition facts are estimates and will vary based on specific ingredient brands and optional additions like cheese.

FAQ

Can I make this casserole ahead of time?

Yes, you can assemble the entire casserole (without the cheese topping) up to 24 hours in advance. Keep it covered tightly in the refrigerator. Add the cheese topping just before placing it in the oven, and you may need to add 5-10 minutes to the initial baking time since it is starting cold.

Why is my casserole watery after baking?

This usually happens if you used fresh mushrooms that weren’t cooked down enough before mixing, releasing excess water during baking, or if the rice was overcooked before assembly. Ensure your mushrooms have released all their liquid and that your broth/milk mixture is adequately thickened before combining everything.

What kind of rice works best?

Long-grain white rice is the standard and yields the best texture. Brown rice can be substituted, but you must cook it much longer (or precook it more thoroughly) as it requires significantly more liquid and time to soften in the oven compared to white rice.

Cream of Mushroom Rice Casserole

A classic, comforting, and easy-to-make casserole featuring creamy condensed soup, tender rice, savory mushrooms, and a crunchy onion topping.

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Prep Time 15 minutes mins

Cook Time 40 minutes mins

Total Time 55 minutes mins

Servings: 6 servings

Course: Comfort Food, Dinner

Cuisine: American

Calories: 410

Ingredients Method Notes

Ingredients

  

Casserole Base

• 1.5 cups Uncooked long-grain white rice Do not cook prior to use
• 10.75 oz can Condensed cream of mushroom soup
• 1 cup Milk (whole or 2%)
• 1 cup Chicken broth Low sodium preferred
• 1 cup Frozen peas and carrots mix Do not thaw
• 8 oz Mushrooms, sliced Cremini or button
• 1 teaspoon Worcestershire sauce
• 0.5 teaspoon Black pepper
• 1 cup Shredded sharp cheddar cheese For mixing in

Topping

• 1 cup French fried onions

Method

 

Instructions

1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13 inch baking dish.
2. In a large mixing bowl, whisk together the cream of mushroom soup, milk, chicken broth, Worcestershire sauce, and black pepper until smooth.
3. Gently fold in the uncooked rice, sliced mushrooms, and frozen peas and carrots mix into the liquid mixture. Ensure the rice is fully submerged.
4. Pour the entire mixture into the prepared baking dish. Cover the dish tightly with aluminum foil.
5. Bake covered for 30 minutes. Remove the foil, sprinkle the shredded cheddar cheese evenly over the top, and return to the oven for another 10 minutes.
6. After 10 minutes, sprinkle the French fried onions over the cheese layer. Bake uncovered for the final 5-10 minutes, or until the topping is golden brown and the rice is tender and fully cooked.
7. Let the casserole rest for 5 minutes before serving to allow it to set slightly.

Notes

For a richer flavor, substitute some of the milk with heavy cream. If the casserole seems too thick before baking, add up to 1/4 cup more broth or milk to ensure the rice cooks properly.