In a large bowl, combine ground turkey, bread crumbs, Parmesan cheese, parsley, onion, garlic, egg, salt, and black pepper.
Shape mixture into small meatballs and place on a baking sheet.
Bake at 375°F (190°C) for 20-25 minutes or until cooked through.
Slice slider buns and spread tomato sauce on the bottom half.
Top with a turkey meatball, a slice of mozzarella cheese, and a basil leaf.
Place the top half of the bun on top and secure with a toothpick.
Repeat with remaining meatballs and buns.
Serve and enjoy!