Black Cocoa Powder: Black cocoa is an ultra-dutch processed cocoa powder meaning all the acidity has been neutralized. The result is a cocoa powder that’s completely mellow, non-bitter, and very black. (Think: Oreo cookies) You can replace the black cocoa with an equal amount of regular or dutch processed cocoa if that’s all you have on hand, however, the final taste of the brownie cookies, while still delicious, will be a little different.