1Heat gas or charcoal grill. In small bowl, mix brown sugar, paprika, cumin, garlic salt and chili powder. Rub both sides of chicken with seasoning mixture.
2Place chicken on grill over medium heat. Cover grill; cook 8 to 10 minutes, turning once, until juice of chicken is clear when center of thickest part is cut (170°F).
3Serve chicken with barbecue sauce.