HEAT grill to medium-high heat.
COMBINE vegetables, tomatoes and dressing. Spoon onto center of large piece of heavy-duty foil. Bring up foil sides. Double fold top and ends to seal packet, leaving room for heat circulation inside.
GRILL 8 to 10 min. or until vegetables are crisp-tender, turning after 4 min.
CUT slits in foil to release steam before opening packet. Sprinkle vegetable mixture with cheese.