COOK pasta in large saucepan as directed on package, omitting salt and adding broccoli to the boiling water for the last 3 min.
MEANWHILE, heat dressing in large nonstick skillet on medium heat. Add chicken and garlic; cook 5 min. or until chicken is no longer pink, stirring occasionally. Stir in spaghetti sauce; cook 5 min. or until chicken is done, stirring occasionally.
DRAIN pasta mixture; return to pan. Add chicken mixture; mix lightly. Top with cheese.