Banana Swirl Bars

1/2 c. butter, softened

1 c. sugar

1 egg

1 t. vanilla extract

1-1/2 c. bananas, mashed

1-1/2 c. all-purpose flour

1 t. baking powder

1 t. baking soda

1/2 t. salt

1/4 c. baking cocoa

In a bowl, beat together butter and sugar; add egg and vanilla. Blend well; stir in bananas. Set aside. In a separate bowl, combine flour, baking powder, baking soda and salt; blend into butter mixture. Divide batter in half; add cocoa to one half. Pour plain batter into a greased 13"x9" baking pan; spoon chocolate batter on top. Swirl with a table knife; bake at 350 degrees for 25 minutes. Cool; cut into bars. Makes 2-1/2 to 3 dozen.