Forget choosing between a cookie, a brownie, and a blondie. The ultimate, old-school, crowd-feeding treat has been hiding in recipe boxes since the 1950s. Congo Bars are the magical, one-pan wonder that combines the rich, buttery flavor of a chocolate chip cookie with the dense, chewy-crisp texture of a blondie. It’s a cookie cake. It’s a bar cookie. It’s sheer, uncomplicated deliciousness that comes together faster than you can preheat the oven.