one at a time. Add mashed bananas, vanilla, cinnamon, and sour cream.
Mix in flour until well blended. Pour batter into well-greased tube pan. Sprinkle topping on top of batter. Bake 45 minutes. (Check for doneness with cake tester) Cool cake on rack 10 minutes.
Since this cake has a topping, it will have to be served out of the pan. Enjoy!