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-high heat. Add chicken and garlic; cook and stir 5 min. or until chicken is lightly browned. Add spaghetti sauce and cream cheese; stir. Bring to boil, stirring frequently; simmer on medium-low heat 5 min. or until chicken is done and cream cheese is completely melted, stirring frequently.
DRAIN pasta mixture; place in large bowl. Add chicken mixture; mix lightly.