Originally posted by: deeznuts
Instead of a marinade, how about just using a rub? You can apply rubs 1/2 hour to 1 hour before cooking, especially after brining. All you need is the rub to draw some moisture out, and it creats a small moist layer on the chicken. Not a big fan of the george foreman myself, I can never get good browning on it. If you are afraid of oil try using some healthier oils, such as olive/canola oils.
Just brown the breasts on each side over medium heat, till golden brown, then finish in the oven or cover up over lower heat. The brine will help keep the chicken from drying out so a bigger margin of error there.