I tried the original 1893 brownie recipe at the Chicago hotel that invented it. It was nothing like a boxed mix.

Source: Business Insider

Chicago's Palmer House serves the original 1893 brownie recipe it invented for the World's Fair. Kristine Villarroel/Business InsiderThe original brownie recipe was invented at Chicago's Palmer House hotel in 1893. It was designed to be transported easily in lunchboxes for the Chicago World's Fair.