Product Recall: Kraft and Polly-O String Cheese and String Cheese Twists. Click here
HEAT oil in large skillet on medium heat. Add vegetables; cook 5 min. or until crisp-tender, stirring occasionally.
DIVIDE vegetables into 4 portions in skillet; top each with cheese slice. Cover skillet; cook on low heat 2 min. or until cheese is melted. Meanwhile, cook franks as directed on package.
FILL buns with franks and vegetable mixture.