HEAT oven to 375ºF.
SPOON 1/3 cup rice onto centre of each of 2 large sheets heavy-duty foil. Fold up all sides of foil slightly to form rim. Pour 1/2 cup water over each mound of rice; top each with 1 fish piece. Surround with spinach; drizzle with dressing.
BRING up foil sides. Double fold top and ends to seal each packet, leaving room for heat circulation inside. Place packets in single layer in shallow pan.
BAKE 15 min. or until fish flakes easily with fork. Cut slits in foil with sharp knife to release steam before opening packet. Top with cheese.
serving size = 1 packet (587 g)