HEAT oven to 400ºF.
COAT chicken with coating mix; place in 13x9-inch pan. Bake 30 min.
MEANWHILE, prick each potato several times with fork. Microwave on HIGH 2 to 3 min. or just until sliceable but not soft. Cut into spears; toss with dressing and cheese.
ADD potatoes to baking dish with chicken. Bake 30 min. or until chicken is done (165ºF) and potatoes are tender.