Combine ground beef, egg, and bread crumbs in medium bowl. Shape into 12 meatballs.
Step2
Arrange meatballs in Crock Pot slow cooker. Pour Pasta sauce over meatballs.
Step3
Cook on Low for 8-10 hours or on High 4 to 6 hours or until meatballs are done. Serve meatballs and sauce in rolls top with shredded mozzarella and parmesan cheese.