COOK pasta as directed on package.

MEANWHILE, cook chicken in dressing in large nonstick skillet on medium-high heat 5 to 7 min. or until chicken is done, stirring occasionally. Stir in vegetables; cover. Simmer on medium heat 5 min. or until vegetables are crisp-tender.

ADD Cheez Whiz and milk to chicken mixture; mix lightly. Cook 2 min. or until Cheez Whiz is melted and heated through. Serve over pasta.