COOK pasta as directed on package, omitting salt.
MEANWHILE, heat oil in large skillet on medium heat. Add chicken, onions and garlic; cook 4 to 5 min. or until chicken is no longer pink, stirring frequently. Stir in tomatoes, vegetables and seasonings. Bring to boil; simmer on medium-low heat 10 min. or until vegetables are tender.
DRAIN pasta; place in large bowl. Add chicken mixture and cheese; toss to coat. Sprinkle with parsley.