Marinate the chicken breast overnight in the grill sauce & 1/2 cup of water. Pre-heat grill to 375 degrees. Cube the chicken breast, apple & onion (save marinade). Build each kabob (onion, apple, chicken, repeat). Drizzle with olive oil. Sprinkle each kabob with salt, pepper & garlic powder. Grill on indirect heat for 10min, turn & cook for another 10min. Once chicken reaches 155 then move to direct heat for 6 min, rotating the kabob every few min or until internal temperature reaches 165. Heat the leftover marinade on the stove & serve as a dipping sauce with the kabobs. Enjoy!