HEAT grill to medium heat.
MIX meat, garlic and 3 Tbsp. Parmesan; shape into 4 patties.
GRILL 6 min. on each side or until done (160ºF). Top with mozzarella; grill 1 min. or until melted.
TOSS lettuce with 2 Tbsp. dressing and remaining Parmesan. Fill buns with lettuce mixture, burgers and remaining dressing.