In a small bowl, cream butter and sugar until light and fluffy. Beat in the egg, banana and vanilla. Combine the flour, baking powder, salt and baking soda; gradually add to creamed mixture and mix well. Stir in chocolate chips., Drop by tablespoonfuls 2 in. apart onto baking sheets coated with cooking spray. Bake at 350° for 13-16 minutes or until edges are lightly browned. Remove to wire racks to cool.