"This came from King Arthur Flour, about 7 years ago."
Dutch-processed cocoa powder
( or 1/2 cup black cocoa plus 1/4 cup Dutch-process)
Put all ingredients into a large bowl in the order they're given. Stir, then beat mixture until smooth.
Spoon the batter into a lightly greased 9x13 baking pan. Bake the brownies in a preheated 375 degree oven for 25-30 minutes, or until they're just barely beginning to pull away from the sides of the pan.