verma:
1 cup                                        All-purpose flour
1/3 cup                                     Unsweetened cocoa
1/4 cup                                     Nonfat dry milk powder
1/4 tsp                                      Baking soda
1/4 tsp                                      Salt
1 large                                      Very ripe banana
1 cup                                        Sugar
2 large                                      Egg whites
1/4 cup                                     Buttermilk
1 tsp                                         vanilla extract
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Oven Temp ~ 350°   
Baking Time ~ 25  Min.
Pan Type ~ 9 inch baking pan
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Preheat oven to 350. Coat baking pan with vegetable cooking spray.

Combine flour, cocoa, milk powder, baking soda and salt
in bowl. Puree banana, sugar, egg whites, buttermilk and vanilla in food processor until smooth. Add dry ingredients and pulse just until blended. Pour into prepared pan. Bake until toothpick inserted in center comes out clean. Cool on wire rack.
Cut into 2 inch squares.