Make a Simple Baked Cheesy Mushroom Casserole

Introduction

A baked cheesy mushroom casserole is the definition of comfort food: rich, creamy, and bursting with the umami magic of mushrooms. This dish is a crowd-pleaser for any gathering, yet comes together simply enough for a weeknight dinner. Behind its irresistible flavor is the perfect harmony of sautéed mushrooms, a cheesy sauce, and a golden, bubbling finish from the oven.

If you’re seeking a side or a vegetarian main that’s guaranteed to elicit recipe requests and second helpings, this casserole delivers both depth of flavor and hearty satisfaction.

What Makes This Cheesy Mushroom Casserole Stand Out

The beauty of this recipe lies in its simplicity—minimal prep work meets maximum flavor. Sautéed mushrooms meld with aromatic garlic and onions, while a blend of cheeses and a splash of cream create a silky, decadent sauce. Baking in the oven allows the cheese to crisp to golden perfection, providing that crave-worthy textural contrast.

With everyday ingredients and the flexibility to be prepped ahead, this dish makes entertaining or family meals effortless. Try it as a vegetarian entrée, or serve it alongside roast meats, pasta, or fresh greens.

Essential Prep for Perfect Mushrooms

Start by prepping your mushrooms and aromatics. For a consistent, even dice that ensures every bite is flavorful, a few swift passes with the Mueller Pro-Series 10-in-1, 8 Blade Vegetable Chopper lets you breeze through onions and garlic while keeping tears to a minimum.

A quality skillet like the SENSARTE Nonstick Frying Pan Skillet, 9.5 Inch ensures that mushrooms brown without sticking, unlocking their deepest earthy notes without added hassle.

Assembling and Baking Your Mushroom Casserole

Once the sautéing is complete, everything comes together in a baking dish lined with a sheet from the Reynolds Kitchens Brown Parchment Paper Roll. The parchment makes cleanup a snap and helps prevent sticking, ensuring you capture every cheesy bit.

After topping with your favorite shredded cheese blend, the casserole is baked until bubbly and golden on top. Use a trusty pair of KitchenAid Ribbed Soft Silicone Oven Mitt Set to safely transfer your bubbling masterpiece out of the oven.

Serving and Storing This Cheesy Delight

Serve your mushroom casserole hot, garnished with a sprinkle of fresh herbs or additional grated cheese. Portion leftovers into Rubbermaid Brilliance Food Storage Containers for a next-day lunch that’s just as satisfying as night one.

Pair this casserole with a crisp green salad, a hearty soup, or even use as a decadent filling for baked potatoes. The cheesy, savory flavors only intensify upon reheating.

Nutritional Information and Serving Size

This recipe yields 6 generous servings. Each serving contains approximately 300–350 calories, depending on cheese and cream choices. The dish is rich yet offers plenty of protein and just enough indulgence for a satisfying meal or side.

Baked Cheesy Mushroom Casserole (Recap)

This casserole brings together the rich flavors of mushrooms, gooey cheese, and creamy sauce with ease. A true crowd-pleaser for any occasion, it’s simple to make, deeply satisfying, and sure to become a repeat classic in your kitchen.

Instructions

1. Preheat your oven to 375°F. Prepare a medium baking dish by lining it with a sheet of Reynolds Kitchens Brown Parchment Paper Roll to prevent sticking and ease cleanup.
2. Using the Mueller Pro-Series 10-in-1, 8 Blade Vegetable Chopper, dice your onion and mince the garlic for even, quick prep.
3. Heat the SENSARTE Nonstick Frying Pan Skillet, 9.5 Inch over medium-high, add oil or butter, and sauté onions until translucent (about 3 minutes). Add garlic and cook until fragrant, about 30 seconds.
4. Add mushrooms, thyme, salt, and pepper. Cook, stirring occasionally, until mushrooms release their moisture and brown (7–10 minutes).
5. Reduce heat to low, then stir in the heavy cream and simmer for 2 minutes.
6. Remove from heat. Stir in half of the mozzarella, all the Parmesan, and half the cheddar. Mix until cheese is just melted and mixture is creamy.
7. Spoon the mixture evenly into the lined baking dish. Sprinkle remaining mozzarella and cheddar over the top.
8. Bake in the oven for 20–25 minutes, or until the casserole is bubbling and the cheese is golden brown. Safely remove the dish using the KitchenAid Ribbed Soft Silicone Oven Mitt Set.
9. Let rest for 5 minutes, garnish with parsley, and serve hot.

Cook and Prep Times

Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes

Enjoy a harmonious mix of cheese and mushrooms with every bite—simple, indulgent, and undeniably delicious!