MIX first 4 ingredients in medium bowl until blended. Add chicken; stir to evenly coat. Refrigerate 20 min. to marinate. Meanwhile, mix peanut butter and sesame dressing until blended.
HEAT grill to medium-high heat. Remove chicken from marinade; discard marinade. Thread chicken, peppers and onions alternately onto 12 skewers.
GRILL 8 to 10 min. or until chicken is done, turning occasionally and brushing with peanut butter sauce for the last few minutes.