Preheat oven to 180 degrees. Grease and line an 8 inch brownie pan.
In a bowl, beat the melted butter, cocoa powder and sugar till fully combined.
Beat one egg at a time till incorporated.
Add the rest of the ingredients and fold in, making sure of a moist mixture. Do not overbeat.
Pour into the prepared pan and bake for not more than 22 minutes.
Allow to cool completely - or you can even enjoy these brownies warm!
Cut into 9-16 peices and serve.