HEAT grill to medium-high heat.
CUT fish into 4 pieces; place 1 piece, skin side down, onto center of each of 4 large sheets heavy-duty foil sprayed with cooking spray. Spoon vegetables over fish. Fold to make packet.
GRILL 8 to 10 min. or until fish flakes easily with fork and vegetables are crisp-tender.
CUT slits in foil to release steam before opening packets. Drizzle with dressing.