From America's Test Kitchen Season 2: Bar Cookies
Classic Brownies boast a balance of cakey and chewy. We wanted a brownie that was distinctly chewy—a moist, dark, luscious brownie with a firm, smooth, velvety texture. It must pack an intense chocolate punch and have deep, resonant chocolate flavor, but it must fall just short of overwhelming the palate.
To develop a rich, deep chocolate flavor, we ultimately found it necessary to use three types of chocolate. Unsweetened chocolate laid a solid, intense foundation; semisweet chocolate provided a mellow, even somewhat sweet, flavor; and cocoa powder smoothed out any rough edges introduced by the unsweetened chocolate (which can contribute a sour, acrid flavor) and added complexity to what can be the bland flavor of semisweet chocolate. We focused on flour, butter, and eggs to arrive at the chewy texture we wanted. Too little flour and the batter was goopy; too much made the brownies dry and muted the chocolate flavor. We melted the butter instead of creaming softened butter with the sugar and eggs; as with our Classic Brownies, the melted butter produced a more dense and fudgy texture.
Makes Sixty-four 1-inch Brownies
Either Dutch-processed or natural cocoa works well in this recipe. These brownies are very rich, so we prefer to cut them into small squares for serving.