HEAT grill to medium heat.
DRIZZLE chicken with 1 Tbsp. dressing. Refrigerate 10 min.
COVER half the grill grate with heavy-duty foil; top with chicken. Grill 6 min. Meanwhile, combine tomatoes, cheese, basil and remaining dressing.
TURN chicken; top with tomato mixture. Grill 6 to 8 min. or until chicken is done (165ºF).