Combine all the ingredients except for the chicken. (To incorporate the peanut butter better, I find it helpful to warm for about 15-20 seconds in the microwave, especially if using natural peanut butter that has been stored in the refrigerator.) Place the chicken in a bowl, add the chicken, and toss to thoroughly coat. Although I often marinate meat in a zipper top bag, I use a bowl for this recipe as I want to be able to easily scrape all the marinade into a saucepan later. Marinate chicken, ideally for a minimum of 3-4 hours or up to all day.