If you're making a rub, like this Carolina BBQ rub, for your chicken, you want to cook the chicken as soon as possible after applying the rub. If you let the rub sit on the chicken too long, you run the risk of it falling off and not seasoning the chicken. Rubs that have a lot of salt, and are left on for too long, can also dry out the chicken. If you are trying to prep this Shish Kabobs made in the oven recipe ahead of time, you can cut the chicken and bell peppers ahead of time. Then, when you're ready to cook, cover the chicken in the Carolina BBQ rub, skewer the chicken, and cook the kabobs in the oven.