In some recipes it really matters which kind you use (and I go into lots more detail in my tutorial Natural Unsweetened vs. Dutch-Processed Cocoa Powder), but you can use either for this chocolate sugar cookie recipe. Natural cocoa powder will produce cookies that are lighter in color and flavor, while using Dutch-processed will yield cookies that have a darker color and richer flavor. I used Hershey's Special Dark cocoa powder (which is Dutch-processed) for the cookies shown in these photos.