HEAT oven to 375ºF.
BLEND first 3 ingredients in blender until smooth. Add 1 cup dressing mixture to vegetables in large bowl; toss to coat. Reserve remaining dressing mixture.
PLACE 1 fish fillet in center of each of 8 large pieces heavy-duty foil; top each with about 1 Tbsp. of the reserved dressing mixture. Cover with vegetable mixture. Bring up foil sides. Double fold top and ends to seal each packet, leaving room for heat circulation inside. Place in single layer in 15x10x1-inch pan.
BAKE 25 min. or until fish flakes easily with fork. Let stand 5 min.; cut slits in foil to release steam before opening packets.
