Grease and flour a 13x9x2-inch baking pan; set aside.Advertisement
In the top of a double boiler, over simmering water, melt chocolate pieces and butter. Stir in coffee until well combined. Cool to room temperature.
In a medium mixing bowl, beat the eggs with electric mixer until foamy. Add the granulated sugar and beat on medium speed for 2 minutes. Reduce speed; beat in chocolate mixture. Stir in flour. Spread in the prepared pan.
Bake in a 325 degree F oven for 45 minutes. Cool in pan on a wire rack. Cut into bars. Sprinkle with powdered sugar, if you like. Makes 36 brownies.