And further: This whole "Philly cheesesteak burger" is nothing new. BK itself pulled a version of this burger on us two years ago. The "Philly Cheeseburger" also had two cheese-and-onion-topped patties, but it was built on a long, seeded hamburger bun. Other fast-food companies have offered Philly cheesesteak burgers — two years ago, Rally's and Checkers even topped theirs with actual shaved beef. (Though it felt obliged to top it with Swiss cheese.)