HEAT oven to 400ºF.
MIX soup, water and Cheez Whiz with whisk until blended; pour 1/3 into 13x9-inch baking dish. Stir broccoli into remaining soup mixture.
STUFF pasta with chicken; place in baking dish. Cover with remaining soup mixture; sprinkle with Parmesan.
BAKE 40 min. or until pasta is tender and chicken is done.