I have used cocoa powder in making a chocolate blond. I was not having the sweetness I wanted so I added 8 oz. of lactose, it is unfermentable by yeast so it will stay in the beer. Next batch I am planning on using the chocolate extract. My beer is based off of a chocolate blond brewed at America's Brewpub in Aurora, IL. My loves the beer, because it is not a stout or porter that you usually find that has chocolate added to it.