Mix Marinade Mix, oil, vinegar and preserves in small bowl. Reserve 2 tablespoons marinade for brushing.
Place chicken in large resealable plastic bag. Add remaining marinade; seal tightly and turn to coat well. Massage chicken and marinade for 5 minutes. Remove chicken from marinade. Discard any remaining marinade.
Grill chicken over medium heat 6 to 7 minutes per side or until cooked through, turning occasionally. Grill peach halves 2 to 3 minutes per side or until lightly browned, brushing with reserved marinade. Serve chicken with grilled peaches.