Bean brownies refer to a type of dessert that combines two popular ingredients - beans and chocolate. The recipe typically involves mixing mashed or cooked beans with cocoa powder, sugar, eggs, vanilla extract, flour, and other optional ingredients such as nuts or fruits to create a moist, dense brownie-like treat. These brownies are often made by vegan bakers who use alternative sweeteners like maple syrup instead of refined sugars, and they can be flavored with spices like cinnamon or nutmeg for added depth of taste. Overall, bean brownies offer a unique twist on the classic brownie recipe while providing a good source of protein and fiber from the beans.