In addition to the new butter (you can also go with their original savory steak butter), the burger includes a grilled beef patty, seasoned shaved Philly steak, Swiss cheese, crispy onions, ketchup, and mayo on a toasted Brioche bun.
The new menu item is a slight twist on the Buttery Steak Burger introduced earlier this year in April.
You can find it at participating Checkers and Rally's restaurants for a limited time.
Photo via Checkers and Rally's.