1

Preheat oven to 350 degrees F. Grease 9x13" pan.

2

In a large mixing bowl, combine butter and sugar and cream together. Add egg and vanilla and beat until thoroughly combined. Blend in bananas.

3

In separate bowl, combine flour, baking powder, baking soda and salt. Add to creamed mixture and mix well.

4

Divide the batter in half. Add the cocoa to ½ the batter. Spread the cocoa batter into the prepared pan. Spoon remaining batter on top and swirl it with a knife.

5

Bake 25 minutes, or until bars test done (toothpick inserted in the middle comes out clean).