1Remove fat from chicken. Cut chicken into 24 pieces. In large glass or plastic bowl, mix remaining ingredients except bell pepper and squash. Stir in chicken, bell pepper and squash. Cover and refrigerate at least 4 hours but no longer than 24 hours.
2Set oven control to broil. Thread chicken, bell pepper and squash alternately on each of eight 8-inch skewers.* Place on rack in broiler pan. Broil with tops 4 inches from heat 2 to 3 minutes; turn. Broil 2 to 3 minutes longer or until chicken is no longer pink in center.