Tip: click step to get into cook mode
Cut low moisture mozzarella cheese into ¾ inch cubes cubes. Store in refrigerator while preparing the meat.
Combine remaining ingredients in large bowl.
Roll golf ball sized balls with the meat mixture. Squish mozzarella cube into the center and pull the edges of the meat ball around it until it's a new ball again.
Arrange meatballs in slow cooker and cover with spaghetti sauce.
Cook on high for 2 to 2.5 hours