HEAT grill to medium heat.
MIX meat and 2 Tbsp. dressing; shape into 8 thin patties. Combine remaining dressing and bacon. Spoon onto centers of 4 patties; top with 2% Milk Singles quarters and remaining patties. Pinch edges together to seal.
GRILL 7 to 9 min. on each side or until burgers are done (160°F).
FILL buns with lettuce, burgers and tomatoes.