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Baked Cheesy Mushrooms Casserole

Baked Cheesy Mushrooms Casserole

This baked cheesy mushrooms casserole is creamy, rich, and full of comforting flavor. Made with sautéed mushrooms and melted cheese, it’s an easy oven-baked dish that works perfectly as a side or a vegetarian main.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 6 servings
Course: Main Dish, Side Dish
Cuisine: American, Vegetarian
Calories: 290
Ingredients Method Notes

Ingredients
  

  • 1½ pounds fresh mushrooms button or cremini, sliced
  • 2 tablespoons butter or olive oil
  • 1 small onion finely chopped
  • 2 cloves garlic minced
  • 1 cup heavy cream or whole milk
  • 1½ cups shredded cheese cheddar, mozzarella, or a blend
  • Salt and black pepper to taste
  • ½ teaspoon dried thyme or Italian seasoning optional

Method
 

  1. Preheat oven to 375°F (190°C) and lightly grease a baking dish.
  2. Heat butter or oil in a large skillet over medium heat. Add mushrooms and cook until they release moisture and begin to brown.
  3. Add onion and cook until softened, then stir in garlic and cook for 30 seconds.
  4. Pour in cream and simmer gently for 2–3 minutes.
  5. Stir in cheese until melted and smooth. Season with salt, pepper, and herbs if using.
  6. Transfer mixture to the prepared baking dish and spread evenly.
  7. Bake uncovered for 25–30 minutes, until bubbly and lightly golden on top.
  8. Let rest for 5 minutes before serving.

Notes

  • Always sauté mushrooms first to avoid a watery casserole.
  • Use freshly grated cheese for the best melting texture.
  • Leftovers can be stored in the refrigerator for up to 3 days and reheated gently.