PLACE large sheet of heavy-duty foil over half of grill grate; preheat grill to medium heat. Pour 2 Tbsp. of the dressing over chicken in resealable plastic bag; seal bag. Turn bag over several times to evenly coat chicken with the dressing. Refrigerate 10 min. to marinate. Remove chicken from marinade; discard bag and marinade.GRILL chicken on uncovered side of grill 6 min. Meanwhile, combine tomatoes, cheese, basil and remaining 2 Tbsp. dressing.TURN chicken over; place, cooked-side up, on foil on grill. Top evenly with tomato mixture. Close lid. Grill an additional 8 min. or until chicken is cooked through (170ºF).