I can't take credit for this recipe at all, but will gladly share it. It showed up in this months Bon Appetite magazine in an article all about cocoa and cocoa recipes. This brownie is unusual in that it uses cocoa powder and browned butter. A little bit of work extra in making, but well worth the effort. Link HERE.
My only caution is to make sure you use a good heavy pan to brown the butter as too thin a pan you run the risk of scorching the butter before it is beautifully browned.
The recipe calls for a "natural unsweetened cocoa" but doesn't make a specific brand request. I used a dark chocolate cocoa from Surfas' Culinary District weg site. The brand I used is their "Black Onyx" cocoa which is an extra rich cocoa which I use in all recipes calling for "cocoa powder". The link to buy it yourself is HERE.