The classic brownie consists of just a few ingredients: butter, sugar, chocolate, eggs, and flour. Fudgy brownies (which purists often claim are the only real brownies) have a minimum of flour—about half a cup—and no leavening such as baking powder at all. Melting the butter rather than creaming it with sugar yields a denser, fudgier outcome. Unsweetened chocolate is the standard, with a full cup of sugar required to balance its bitterness. Either granulated or brown sugar may be used; substitute one for the other in equal proportions. The deeper the color of the sugar, though, the more pronounced the molasses flavor. It’s all a matter of personal taste.