Four ingredients combine for a cheesy meatball dish you can serve as an appetizer or in hoagie buns as a main dish.
Spoon about 1/3 of the jar of spaghetti sauce into a 13x9x2-inch baking dish.
Arrange the meatballs in the sauce. Pour the remaining sauce over the meatballs. Sprinkle the meatballs with pepper. Top with mozzarella.
Bake, uncovered, in a 350° oven 30 to 40 minutes or until meatballs are heated and cheese is bubbly. If you like, serve in hoagie buns and sprinkle with additional mozzarella cheese.