Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add chicken; cook 3 minutes on each side or until browned. Add pepper stir-fry and next 6 ingredients (through red pepper), stirring to combine. Pour tomatoes over chicken mixture; bring to a boil. Cover, reduce heat, and simmer 5 minutes. Uncover; cook 3 minutes. Add parsley and butter, stirring until butter melts.