Preheat oven to 350 degrees F (175 degrees C). Grease and flour an 8 inch square pan.

In large saucepan, melt 1/2 cup butter. Remove from heat, and stir in sugar, eggs, and 1 tsp vanilla. Beat in 1/3 cup cocoa,1/2 cup flour, salt and baking powder. Spread batter into prepared pan

Bake in pre heated oven for 25-30 mins. Do not overcook