Preheat the oven to 350 degrees.
You will need a greased 13×9 baking pan.
1/2 cup softened butter or margarine
1 cup sugar
1 teaspoon vanilla extract
1-1/2 cups mashed bananas- you will need 3 or 4 bananas
1-1/2 cup flour
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1/4 cup baking cocoa
Cream the butter and sugar.
Add egg and vanilla and mix well.
Add the flour, baking powder, baking soda, and salt. Mix until smooth. Pour half of the batter into another bowl.
To the mixing bowl add the cocoa powder and mix well.
Spread the cocoa mixture into greased pan.
Carefully spread the reserved batter over the top and use a knife to swirl the batter.
Bake for 25-30 minutes til bars test done when a toothpick is inserted in the middle.
Cool before cutting.
Makes 12-16 bars.
They are very moist so don’t stack together for storage, without putting a paper towel in between layers.