Preheat oven to 425F, rinse and drain mushrooms, remove stems; set aside. Step

In a large skillet, cook chopped stems, sausage, onion, sweet pepper, and garlic over medium heat until sausage is brown, stir in spinach until wilted, stir in parmesan cheese and bread crumbs, remove from heat, spoon sausage mixture into mushroom caps, place on a greased baking sheet. Step

Bake about 10 minutes or until stuffing is brown and mushrooms are tender, remove, cool, and enjoy!