Sausage-Stuffed Mushrooms

Step 1
Preheat oven to 325 degrees F (165 degrees C). Grease a baking sheet.

Step 2
Melt butter in a large skillet over medium heat; cook and stir mushrooms in butter until softened, about 5 minutes. Transfer mushrooms to a plate and allow to cool.

Step 3
Heat another skillet over medium-high heat; cook and stir sausage, onion, and garlic until meat is crumbly, evenly browned, and no longer pink, about 10 minutes. Drain and discard any excess grease. Transfer mixture to a large bowl and stir in bread crumbs, Parmesan cheese, mozzarella cheese, Italian seasoning, and parsley.

Step 4
Arrange mushrooms gill sides up on prepared baking sheet. Spoon sausage mixture into mushroom caps.

Step 5
Bake in preheated oven until cheese is melted, about 30 minutes.