Pre-heat your oven to 350 degrees and grease your loaf pan.
In a bowl, mash up bananas with a fork until it becomes a baby food consistency, then combine eggs, vanilla, milk, sour cream, melted butter and sugar(s).
Next, add in your dry ingredients; flour, baking powder, baking soda, cinnamon and stir until combined.
Pour batter in a buttered pan. Sprinkle cinnamon sugar mix over top and drag a knife or toothpick in a swirling motion.
Bake on 375 for about 40 minutes or until a toothpick in the center comes out clean.
Allow the bread to cool before serving.
