COOK and stir vegetables in large nonstick skillet on medium-high heat 3 min. Add chicken; cook and stir 3 to 4 min. or until no longer pink.
STIR in barbecue sauce; cook on medium heat 3 min. or until chicken is done, stirring occasionally.
SPOON down centers of tortillas; top with cheese. Roll up. Cut diagonally in half to serve.