(http://en.wikipedia.org/wiki/BK_grilled_chicken_sandwiches. The original BK broiler was served with a dill ranch sauce and on a oat dusted bun. Some say it had mayonnaise- So use which one you remember! one chicken breast produces 2 sandwiches. You can use a wheat bun that has oats on top or just use a sesame seed bun like on the whopper and use which sauce you remember. it would be easy just to add dill to your ranch dressing, but I personally don't think it makes a difference.