1In 3-quart saucepan, cook and drain pasta as directed on package. Return to saucepan.
2Meanwhile, in 2-quart microwavable casserole, place frozen vegetables and cheese sauce. Loosely cover with microwavable plastic wrap. Microwave on High 8 to 10 minutes, stirring twice, until cheese sauce melts and vegetables are just crisp-tender.
3Stir vegetables, chicken and cheese into pasta. Cover; cook over low heat 2 to 3 minutes or until cheese is melted. Stir gently.