Slow Cooker Meatball Subs Prep Time: 20 minutes Cook Time: 4 hours Servings: 4 Share: PRINT EMAIL PDF Pinterest This Recipe Calls For Chunky Sauces Tomato, Garlic & Onion Sauce Shop Now Ingredients 1 lb. lean ground beef 1/2 cup Italian seasoned dry bread crumbs 1 egg 1 jar RAGÚ® Tomato Garlic & Onion Sauce 1 package (8 oz.) Fresh Mozzarella cheese Get Ingredients Instructions Combine ground beef, bread crumbs and egg in medium bowl; shape into 12 meatballs. Arrange meatballs in slow cooker; pour sauce over meatballs. Cook covered on LOW 8 to 10 hours or HIGH 4 to 6 hours. Stir in cheese and cook covered an additional 5 minutes or until cheese is melted. Serve in Italian rolls, top with Parmesan cheese if desired.