Birger King will test a toasted brioche bun, which it calls a bagel, in Huntsville, Alabama and Albuquerque, New Mexico beginning September 12.
The two Burger King locations will both be getting a special limited-time-only "Everything Menu" featuring sandwiches that diners are already familiar with, but come on toasted brioche buns.
These sandwiches are the Whopper, an Everything BK Royal Crispy Chicken Sandwich, and an Everything Breakfast Sandwich.
It's not specified whether they will use the bagel bun on other menu items at these test sites.