1.Combine first 7 ingredients in a saucepan. Cook over medium heat until brown sugar dissolves. Remove from heat, cool completely.
2. Place chicken in a zip-top plastic bag. Pour half of apple juice mixture over chicken, seal bag, and marinate in refrigerator 8 to 24 hours.
3. Prepare grill.
4. Remove chicken from bag, discard marinade.Place chicken on grill rack coated with cooking spray, cover and grill 6 minutes on each side or until done, basting occasionally with reserved half of marinade. Garnish with thyme.