Chocolate Bottom Banana Squares

From the blog baking and love" - http://www.caketree.sg/6281339"

In mixing bowl , cream butter and sugar.

Add egg , vanilla , and bananas , beating thoroughly.

In a separate bowl , combine flour , soda , baking powder , and salt.

Add to creamed mixture and mix well.

Divide batter in half.

Add the cocoa to one portion of the batter.

Spread that portion in the bottom of a greased 9 x 13-inch baking dish.

Spoon remaining batter on top , swirling gently with butter knife if desired , and sprinkle with chocolate chips.

Bake at 350 degrees for 30 minutes or until batter tests done with a toothpick or fork.

Cool and cut into 24 squares.

butter, sugar, egg, vanilla, mashed bananas, flour, baking powder, baking soda, salt, baking cocoa, chocolate chips