Mix all the ingredients, minus the chicken breast in a bowl. Place the chicken breasts in a dish and pour the marinade over them,turning them in the marinade to ensure that they are completely coated.
Cover the dish with a lid or plastic wrap and place in the fridge for at least an hour.
Place the chicken on a hot grill and cook, turning once, until the meat has an internal temperature of 165F. Grilling boneless skinless chicken breast takes about 15-20 minutes, but can vary depending on the size and thickness of the meat.
Remove from the grill and let the chicken breast rest for a few minutes before serving to allow the juices to draw back into the centre of the meat.