Prepare the mushrooms: Remove the stems from the mushrooms and set the caps aside. Finely chop the mushroom stems and set them aside for the filling.Cook the sausage: In a skillet over medium heat, crumble and cook the sausage until browned and cooked through (about 5-7 minutes). Drain any excess fat.Make the filling: In a bowl, combine the cooked sausage, chopped mushroom stems, cream cheese, Parmesan, mozzarella, breadcrumbs, garlic, and season with salt and pepper. Mix until the filling is well-combined.Stuff the mushrooms: Fill each mushroom cap with the sausage mixture, pressing gently to pack it in.Air fry the mushrooms: Preheat the air fryer to 375°F (190°C). Place the stuffed mushrooms in the air fryer basket in a single layer. Air fry for about 8-10 minutes, or until the mushrooms are tender and the tops are golden and crispy.Garnish and serve: Once cooked, remove the mushrooms from the air fryer and garnish with chopped parsley if desired. Serve immediately and enjoy!