Preheat oven at 180° C for 15 minutes. Line base and sides of an 8 inch square pan with baking paper.

Melt butter in a sauce pan and let it come to room temperature.

Beat melted butter, sugar, eggs and vanilla essence until smooth.

In a bowl, sift together the flour, cocoa powder and baking powder. Fold this flour mixture into the batter. Finally, fold in walnuts and spread the mixture into the prepared pan.

Bake for 20 minutes or until a toothpick inserted in the centre come out clean. (do not over bake)

Let it cool completely in pan. Cut into squares.

NOTE - i used hershey's natural unsweetened cocoa in this recipe.

Recipe source - www.hersheys.com