Stuffed Mushroom Casserole

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Ever crave the comforting flavor of stuffed mushrooms but wish it came in a hearty, scoopable form? This Stuffed Mushroom Casserole delivers everything you love—creamy, garlicky filling, golden-crisp topping, and savory mushroom flavor—in a dish that feeds a crowd without the fuss of stuffing each cap.

Think of it as your favorite party appetizer reimagined for the dinner table. The casserole format brings in a cozy, family-style vibe while maintaining all the rich, cheesy decadence you expect. Plus, it’s weeknight-friendly and perfect for prepping ahead of time.

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Preparation Phase & Tools to Use

Before you start, gather your kitchen essentials. For this casserole, a deep baking dish is non-negotiable—it holds the layered mushroom filling and allows for even baking and bubbling edges. A large nonstick skillet is key for sautéing the mushrooms until golden brown without sticking. You’ll also want a sharp chef’s knife to chop onions and garlic efficiently, and a sturdy mixing bowl to combine your creamy filling base.

If you have a food processor, it can help speed up chopping and even blending the filling if you like it smoother. Finally, a spatula is your best friend for spreading and smoothing layers without breaking the mushrooms.

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Ingredients for the Stuffed Mushroom Casserole

• Mushrooms: The star of the dish. Their earthy flavor forms the base and adds that classic stuffed mushroom essence.
• Cream Cheese: Brings richness and a luscious texture to the filling.
• Parmesan Cheese: Adds nutty sharpness and helps form a golden crust on top.
• Italian Sausage (optional): Gives the dish extra savory depth and heartiness.
• Breadcrumbs: Essential for the topping—they crisp up beautifully and create that irresistible crunch.
• Onion & Garlic: Aromatic staples that intensify the flavor foundation.
• Fresh Parsley: A pop of color and brightness to finish.
• Butter & Olive Oil: For sautéing and enhancing richness.

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How To Make the Stuffed Mushroom Casserole

Step 1: Prep the Mushrooms

Wipe the mushrooms clean with a damp towel, remove the stems, and chop them finely. Keep the caps whole and slice any oversized ones for easier layering.

Step 2: Build the Flavor Base

In a large skillet, heat butter and olive oil. Sauté onions and garlic until soft and fragrant. Add chopped mushroom stems and cook until most moisture is gone. If using sausage, add it now and brown fully.

Step 3: Create the Filling

Stir in cream cheese, Parmesan, salt, and pepper until creamy. Mix well until everything is incorporated. This becomes your savory filling base.

Step 4: Assemble the Layers

Lightly grease your baking dish. Spread mushroom caps evenly across the base. Spoon and spread the creamy filling over them. Top with seasoned breadcrumbs and a light Parmesan sprinkle.

Step 5: Bake to Perfection

Bake at 375°F (190°C) for about 25 minutes, or until bubbling at the edges and the topping is golden brown. Let it sit for 5 minutes before serving.

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Serving and Storing This Casserole Delight

This casserole is best served hot right out of the oven, when the top is golden and crisp, and the filling is warm and melty. Pair it with a light green salad or roasted veggies to balance its richness. It also works beautifully as a side for grilled meats or a holiday table centerpiece.

To store leftovers, let the casserole cool to room temperature. Transfer to an airtight container and refrigerate for up to 4 days. Reheat in a 350°F oven until warmed through to maintain the texture. Avoid microwaving if you want the breadcrumb topping to stay crispy.

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Frequently Asked Questions

What kind of mushrooms should I use?

Cremini or white button mushrooms work well. They hold their shape and have a mellow, savory flavor.

Can I make this casserole ahead of time?

Yes! Assemble everything up to the baking step, cover, and refrigerate for up to 24 hours. Bake fresh when ready to serve.

Is this casserole gluten-free?

To make it gluten-free, use gluten-free breadcrumbs. Everything else can stay the same.

Can I make it vegetarian?

Absolutely. Just skip the sausage and add more mushrooms or finely chopped spinach for substance.

Can I freeze it?

It’s best enjoyed fresh, but you can freeze it before baking. Wrap tightly and freeze for up to one month. Bake from frozen, adding 10-15 extra minutes.

How do I make it spicier?

Add crushed red pepper flakes to the filling or mix a bit of hot sauce into the cream cheese for a little kick.

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Want More Casserole Ideas?

If cozy casseroles are your comfort zone, there are more delicious dishes to explore. The Buffalo Chicken Lasagna layers spicy heat with creamy cheese for a fiery twist. For something with a nostalgic feel, the Sloppy Joe Casserole is hearty, tangy, and perfect for weeknight cravings.

Craving more veggie-packed comfort? The Cheesy Broccoli Rice Casserole is gooey, vibrant, and kid-friendly. Or take a bite of the Pepperoni Pizza Casserole for a flavor-packed dinner that feels like Friday night.

And don’t miss the Creamy Crockpot Mac and Cheese for the ultimate slow-cooked indulgence—creamy, comforting, and completely crave-worthy.

Pin and Tell Me How Yours Turned Out

You can save this to your casserole board for later. Just click the Pin button.

If you try it, I’d love to know how it turned out for you. Did you add sausage? Go vegetarian? Leave your twist in the comments below!

Looking for even more everyday comfort food ideas? You’ll find daily inspiration on my Pinterest LadyPlate board.

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