Be sure you SIFT the sugar and cocoa powder into the cream; if you don't, you will get lumps of powder in your whipped cream, which aren't the most pleasant things to eat.
LM - this is a fabulous treat to top off a variety of things. Tonight we used it to top off Mochas and then my DD licked the rest of the bowl clean! A definite keeper for ease of making and just the purity of it compared to any storebought whipped cream. Thanks for sharing. Made for Photo Tag.