Combine the garlic powder, rice vinegar, soy sauce, hoisen sauce, brown sugar, sesame oil, sesame seeds, and ginger. Combine the hot water and peanut butter until smooth and add this to the marinade.
Place the chicken into the marinade, and cover and marinate at least 3 hours.
Put the chicken on the skewers with the pepper in between. Grill on medium heat for about 5-7 minutes on each side or until chicken is no longer pink.
(Optional) While the chicken is cooking, place the marinade in a medium sized saucepan. Bring to a boil for about 4-5 minutes and turn to low and let simmer until the chicken is done. Pour over the cooked chicken skewers for extra sauce. I always do this because I hate wasting the marinade. :)