COOK pasta in large saucepan as directed on package.
MEANWHILE, heat dressing in large skillet on medium heat. Add chicken and vegetables; cook 10 to 12 min. or until chicken is done, stirring frequently. Add broth and Neufchatel; cook 1 min. or until Neufchatel is melted, stirring constantly. Stir in Parmesan.
DRAIN pasta; return to pan. Add chicken mixture; mix lightly. Cook 1 min. or until heated through. (Sauce will thicken upon standing.)