Toss vegetables with dressing and 1/2 tsp. thyme; spread onto bottom of 15x10x1-inch pan sprayed with cooking spray.
Bake 10 min. Meanwhile, mix stuffing mix and water just until blended.
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 min. or until meat is done (145F).
Remove from oven.
Let meat stand 3 min. before serving with the vegetables.