Preheat oven to 350 degF. In a medium bowl, mash banana well. Add next 4 ingredients and stir well. Add next 4 dry ingredients and stir gently until just mixed. Pour into a greased 8” square or round pan. Mix sugar and cinnamon in a small cup and sprinkle mixture of top of cake. Bake for 35 minutes and cool for at least 15 minutes. Cut into squares and wedges and serve warm.