Preheat oven to 400°F. Use a spoon to remove stems and gills from the mushrooms and place on a sheet pan.
Heat butter in a 10-inch nonstick skillet over medium heat. Add onion, asparagus, and garlic. Sauté until vegetables are tender. Transfer to a mixing bowl.
Combine the sautéed vegetables with cream cheese, shrimp, and Alfredo Extraordinaire.
Stuff mushrooms with shrimp mixture. Bake for about 20 minutes or until mushrooms are tender.
Top with mozzarella cheese and broil for 2-3 minutes or until cheese is melted and browned.
