Black Bottom Banana Bars

Black Bottom Banana Bars

(I make my own cream cheese icing to go on top, but the recipe leaves them un-iced.)

1/2 cup soft margarine or butter
1 cup sugar
1 egg
1 tsp. vanilla
3 ripe, mashed bananas
1~1/2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
1/4 cup cocoa (baking)

Cream butter and sugar. Add egg and vanilla. Beat until thoroughly combined. Blend in the bananas. Combine the flour, baking powder, baking soda and salt; add to creamed mixture and mix well. Divide batter in half and add cocoa to half. Spread into a greased 13x9x2 pan. Spoon remaining batter on top and swirl with a knife. Bake at 350 degrees for 20-25 minutes or until it tests done.