A different take on the classic brownie.
In a bowl, combined butter, sugar and cocoa. Stir in eggs, milk and vanilla. Blend in flour, baking powder and salt. Stir in bananas and walnuts. Grease a 9 inch square pan and pour in the batter. Bake at 350 degrees for 40 to 45 minutes. Cool in a pan on a wire rack. Cut into bars.