Put the meatballs in a small slow cooker and cover with the pasta sauce. Cook on low for 3-4 hours.

When you're ready to eat, preheat the broiler on the oven. Place the hot dog buns on a cookie sheet.

Put 4 meatballs in each hot dog bun and sprinkle each with 1/4 cup mozzarella cheese.

Heat under the broiler until cheese is melted.