HEAT greased barbecue to medium-high heat. Mix turkey, 3 Tbsp. dressing and seasoning mix; shape into 12 thin patties. Combine cheese and 2 Tbsp. salsa; spoon onto centres of 6 of the patties. Cover each with second patty; pinch edges together to seal.

GRILL 7 min. on each side or until done (170ºF). Meanwhile, combine remaining salsa and dressing.

PLACE lettuce, tomatoes and burgers on bottom halves of buns; cover with salsa mixture and tops of buns.