HEAT grill to medium heat.

COVER half the grill grate with sheet of heavy-duty foil. Place chicken in large resealable plastic bag. Add 2 Tbsp. dressing; seal bag. Turn bag over several times to evenly coat chicken with dressing. Refrigerate 10 min. Remove chicken from bag; discard bag and dressing.

PLACE chicken on uncovered side of grill; cover with lid. Grill 6 min. Meanwhile, combine remaining dressing, tomatoes, cheese and basil.

TURN chicken over; place on foil. Top with tomato mixture. Grill, covered, grill 8 min. or until chicken is done (165ºF).