Preheat oven to 400F.
Mix meat, cracker crumbs, Parmesan cheese and 2 Tbs of the marinara sauce in medium bowl.
Shape into 3 meatballs, about the size of a golf ball
Place 2 inches apart, in shallow baking pan sprayed with cooking spray.
Bake for 15 min. or until meatballs are cooked through (160F).
Place 3 meatballs on hotdog bun
Top with marinara sauce and mozzarella cheese (if desired)
Place back in oven for 5 minutes until cheese is melted
Wash up. Making meatballs is hands-on work, so put food safety at the top of your to-do list. Keep things clean by washing your hands before and after this recipe.