Step 1

Preheat the oven to 375 degrees F. Coat a sheet pan with cooking spray and arrange the mushrooms on the pan.

Step 2

Melt 1 tablespoon of butter in a pan over medium heat. Add the onion and garlic and cook for 3-4 minutes or until softened. Remove the onion mixture from the pan.

Step 3

Add the sausage to the pan and cook for 5-6 minutes, using a spatula to break up the meat into smaller pieces.

Step 4

Place the sausage, onion mixture, cream cheese, parmesan cheese, Monterey Jack cheese and 3 tablespoons of parsley in a bowl. Stir to combine.

Step 5

Spoon the sausage mixture evenly into the mushroom caps.

Step 6

Melt the remaining 2 tablespoons of butter in the microwave and stir in the panko breadcrumbs to coat.

Step 7

Sprinkle the panko over the mushrooms.

Step 8

Bake for 20 minutes or until tops are browned and mushrooms are cooked through. Sprinkle with parsley, then serve.