HEAT large nonstick skillet sprayed with cooking spray on medium-high heat. Add chicken; cover with lid. Cook 5 to 7 min. on each side or until chicken is done (165ºF). Remove chicken from skillet; cover to keep warm.
ADD vegetables to skillet; cook, uncovered, 4 min. or until crisp-tender, stirring occasionally.
STIR in broth and dressing. Return chicken to skillet; cook 1 min. or until chicken is heated through.