Mix together ground beef, garlic, onion, egg, bread crumbs, salt and pepper and HALF of the tomato sauce mixture.
Form meat mixture into 8 meatballs; set aside.
Attach grill plates; preheat your George Foreman grill to 400°F.
Place slider plate on top of bottom grill plate; place one meatball into each opening.
Close grill and cook 4-6 minutes or until meatballs are done (165°F).
For each slider, place 1 piece of cheese folded in half on bottom of bun. Top with burger and 1 spoonful of sauce. Sprinkle sauce with Parmesan cheese. Cover with top bun and secure with party picks to serve.