I have to agree with marmalady. I suppose there are all sorts of ways to doctor up a brownie mix, but why bother? The brownie recipe I (mostly) use is Katherine Hepburn's . . . essentially, on the stove in a kettle, melt a stick of butter together with 3 squares baking chocolate, add a cup of sugar, an egg, 1/4 - 1/3 cup flour (
depending on how gooey you like your brownies), salt and vanilla. The lengthiest part of the process is waiting for the stove to reach 325 degrees. Scratch beats a mix any day!!