Black Bottom Banana Bars

This is another oldie. It's from an old TOH magazine and I've  made it many times. 

Ingredients:

1/2 cup butter, softened to room temp.
1 cup sugar
1 egg
1 teaspoon vanilla extract
1 and 1/2 cups mashed ripe bananas (about 3 medium)
1 and 1/2 cups all purpose flour
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1/4 cup baking cocoa

Directions:

Preheat oven to 350 degrees F.

In a mixing bowl, cream the butter and sugar. Add egg and vanilla and beat until thoroughly combined. Mix in the bananas.

Combine the flour, baking soda, baking powder,salt in another bowl and whisk together.

Add the flour mixture to the creamed mixture and mix well.

Divide the batter in half.

Add cocoa to half of the batter.

Prepare  13 x 9 x 2 inch pan with baking spray.

Place the cocoa mixture on the bottom of the pan and spread evenly.

Spoon the creamed mixture on top of the cocoa layer and swirl with a knife.

Bake at 350 degrees F for 25 minutes and test the bars with a toothpick to make sure they are done. Toothpick should come out clean.

Place on wire rack and allow to cool.

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