The summer before last we tried something we saw on the Paula Deen cooking show on Food Network. Use a Krispy Kreme doughnut as a hamburger bun. The KK in our city had closed shop so we bought other glazed, raised doughnuts, cut them in half, grilled burgers, and put our normal fixings on. YUM! Family and Friends thoughts we were crrrrrraaaazzzzzzy for even trying such a thing. The only thing I would advise anyone else brave enough to give this a try... cut the doughnut in half and put the sticky side in.
Now, I am not a fan at all of KFC but it looks like they did the same with a chicken sandwich.