COOK pasta as directed on package, omitting salt.
MEANWHILE, heat 2 Tbsp. dressing in large skillet on medium-high heat. Add chicken; cook 2 to 3 min. on each side or until evenly browned. Combine tomatoes, peppers, onions and remaining dressing; pour over chicken. Bring to boil; simmer on medium-low heat 10 min. or until chicken is done (165ºF).
TOP with cheese; cover. Remove from heat. Let stand 2 to 3 min. or until melted. Drain pasta. Serve topped with sauce and chicken.