Drain, but do not rinse, the canned black beans (OR drain the cooked black beans reserving 1/4 cup liquid). Place them in a bowl and use a fork or potato masher to mash the beans. Keep mashing until they're mostly broken up, but still have some whole beans visible. Add the breadcrumbs, onion, egg, chili powder, salt, pepper, and hot sauce. Stir until everything is combined, then let the mixture sit for 5 minutes.