HEAT oven to 375°F. Toss vegetables with dressing and 1/2 tsp. thyme; spread onto bottom of 15x10x1-inch pan sprayed with cooking spray. Bake 10 min. Meanwhile, combine stuffing mix and water.
CUT each tenderloin diagonally into thirds. Spoon vegetable mixture to sides of pan. Spoon stuffing down center of pan; top with meat and remaining thyme.
BAKE 45 to 50 min. or until meat is done (160°F).