COOK pasta as directed on package, omitting salt.
MEANWHILE, heat large nonstick skillet sprayed with cooking spray on medium-high heat. Add chicken; cook and stir 2 min. Stir in salsa, corn and peppers. Bring to boil. Simmer on medium-low heat 10 min. or until chicken is done, stirring occasionally.
DRAIN pasta. Add to chicken mixture; mix lightly. Top with cheese. Remove from heat; cover. Let stand 1 min. or until cheese is melted.
