COOK pasta as directed on package, omitting salt.
MEANWHILE, cook and stir chicken in hot oil in large skillet on medium heat 5 min. or until chicken is done. Remove from skillet; cover to keep warm. Add dressing and vegetables to skillet; cook 4 to 5 min. or until vegetables are crisp-tender, stirring occasionally.
DRAIN pasta, reserving 1/4 cup of the cooking water. Place pasta in large bowl. Add chicken and vegetable mixture; mix lightly. Gradually stir in reserved pasta water, if needed, until pasta mixture is of desired consistency. Top with cheese.