1. Heat grill to medium-high heat.
2. Process first 4 ingredients in food processor until blended. Reserve half the barbecue sauce mixture.
3. Sprinkle chicken with pepper. Grill 5 to 7 min. on each side or until done (165ºF), turning occasionally and brushing with remaining barbecue sauce mixture for the last few minutes.
4. Serve with reserved barbecue sauce mixture.