banana coffeecake

Found this recipe here and it was fabulous!!Changed a bit and it was still PLENTY sweet enough! Not sure if layers were necessary.Streusel topping:Stir together 2/3 c choco chips (I use these), 1/2c brown sugar, 1tbs cinnamon, 1/2c chopped walnuts(or stir them into batter)1.5 c flour1 scant tsp baking soda1 scant tsp baking powder1/4tsp salt2-3 bananas mashed (3 gives alot of banana flavor)1/4c