In a large bowl, combine all meatball ingredients, except the mozzarella; using your hands, mix until fully combined.
Take a golf ball sized piece of the ground beef mixture and place a piece of mozzarella in the middle.
Press meat around the piece of cheese, fully enclosing it; repeat until all meat is used.
Place meatballs in the crock pot and submerge in sauce.
Cover and cook on high for 2 - 2½ hours, or until meat is fully cooked.
Serve over pasta.