New York (CNN Busiiness) Popeyes' spicy chicken sandwich is the only thing in the fast food business that's hotter than Burger King's Impossible Whopper. That's great news for Restaurant Brands, which owns both chains.

Restaurant Brands QSR reported solid earnings for the third quarter Monday morning, led by a more than 10% increase in sales at Burger King and nearly 15% surge at Popeyes.

The company said sales at Burger King restaurants open at least a year rose 5% in the quarter. That was the strongest growth since 2015.

Restaurant Brands attributed the success of the plant-based Impossible Whopper, which has been rolled out to all Burger King locations in the United States, for the strong sales.

Popeyes did even better, with same-store sales in the United States soaring more than 10%. Restaurant Brands said that was the best quarter for the chain in nearly two decades.