Using a sharp knife, cut through the two chicken wing joints; remove and discard wing tips. Place remaining wing pieces in a large resealable plastic bag. Add flour; seal and shake to coat. Transfer chicken to a 4- or 5-qt. slow cooker coated with cooking spray., In medium bowl, combine remaining ingredients; pour over chicken. Cook, covered, on low until chicken juices run clear, 4-5 hours. If desired, top with chives and serve with ranch dip.