In large bowl, mix beef, bread crumbs, crushed basil leaves, milk, egg, salt and pepper with hands until well combined. Shape mixture into small balls about the size of a ping-pong ball. With finger, make hole in 1 ball but do not go all the way through. Place 1 piece of cheese in hole; enclose cheese by pinching hole back together. Repeat with remaining beef mixture and cheese pieces. Spray 3½- to 4-quart slow cooker with cooking spray. Pour pasta sauce into cooker. Place meatballs in sauce. Cover; cook on low heat setting 4 hours. About 25 to 30 minutes before meatballs are done, cook pasta as directed on package; drain.

Serves 4.