Heat oven to 375°F. Separate dough into 8 biscuits. Separate each biscuit into 2 layers. Press each biscuit layer to make 3-inch round. Place 1 meatball half, cut side up, and 1 string cheese piece in center of each dough round. Wrap dough around meatball and cheese, pressing edges to seal. Place seam side down in single layer in ungreased 8- or 9-inch round pan. Sprinkle evenly with Parmesan cheese, Italian seasoning, and garlic powder. Bake 20 to 25 minutes or until golden brown and biscuits are no longer doughy in center. Remove from pan. Serve warm with warm spaghetti sauce for dipping. Makes 8 servings.