Black-Bottom Banana Bars 1/2 cup butter or margarine (softened) 1 cup sugar 1 egg 1 tsp. vanilla 1 1/2 cups mashed ripe bananas (about 3 bananas) 1 1/2 cups all purpose flour 1 tsp. baking powder 1 tsp. baking soda 1/2 tsp. salt 1/4 cup baking cocoa In a mixing bowl, 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...