Burger chain Fatburger, owned by FAT Brands Inc., is adding a new burger to its menu lineup: the Flatburger, available through June 30, 2026, at participating locations.

The Flatburger features two fresh lean-beef patties smashed on the grill, topped with American cheese, grilled onions, pickles, and a creamy sauce for a rich, tangy kick. The chain’s all-new smash style burger follows Fatburger’s other successful burger introductions, including being the first major fast-casual chain to launch a plant-based burger in 2018, in addition to the Skinnyburger, with the burger serving as the bun, in 2014.

“At Fatburger, we aim to deliver a fresh experience that resonates with our guests,” said Jenn Johnston, chief marketing officer at FAT Brands. “While our classics remain beloved, we are always exploring new twists on our burgers — and the Flatburger does exactly that — pressed-to-order with a caramelized, crispy edge and unbeatable flavor.”

Source: FAT Brands