I've made this a few times now and everyone loves it. It is super easy!
Favorite Pasta Sauce
Monterey Jack Cheese/Provolone or Cheddar
Heat meatballs in a shallow dish @ 375 until internal temperature reaches 165. Add pasta sauce on top of meatballs about half way through. Butter hoagie buns and sprinkle with garlic salt. Place hoagies under the broiler until edges are golden brown. Add meatballs to sub and top with your favorite cheese. Place back under the broiler until cheese melts and VOILA! Super easy, quick dinner.