HEAT large skillet sprayed with cooking spray on medium-high heat. Add chicken; cover. Cook 5 min. on each side or until lightly browned on both sides.
ADD vegetables, pesto and water. Bring to boil. Cook on medium heat 6 to 8 min. or until chicken is done (165°F), stirring occasionally.
SPRINKLE with cheese; cover. Remove from heat; let stand 5 min.