Separate each biscuit into 2 layers and press each layer into a 3-inch round. Place 1 meatball and 1 string cheese piece in center of biscuit layer. Wrap dough around meatball and cheese, pressing edges to seal.
Place seam side down in an ungreased 8 or 9-inch round cake pan and sprinkle with Parmesan cheese, Italian seasoning and garlic powder. Bake at 375°F for 20 to 25 minutes or until golden brown. Serve with warm marinara sauce for dipping.