Preheat your oven to 350°F (175°C). Clean and chop the mushrooms, garlic, and onions.

In a large skillet over medium heat, melt two tablespoons of butter. Add the chopped onions and minced garlic, cooking for 3-5 minutes until translucent and fragrant.

In a mixing bowl, combine the sautéed onion and garlic with cream cheese and shredded cheese. Stir in seasonings and mix until well incorporated.

Spread half of the breadcrumbs in a greased 9x13-inch baking dish. Layer the mushroom mixture on top evenly, then sprinkle remaining breadcrumbs.

Bake for 30 minutes in the preheated oven. The top should turn golden brown and bubble at the edges.

Once baked, remove from oven and let stand for 5-10 minutes before serving.