PREPARE pasta as directed on package.
MEANWHILE, spray large nonstick skillet with cooking spray. Add chicken; cook and stir on medium-high heat until cooked through. Add green pepper; cook and stir 1 minute.
STIR in sauce; cook on low heat 1 minute or until thoroughly heated. Toss with pasta. Serve with KRAFT 100% Grated Parmesan Cheese, if desired.