Preheat your oven to 350 F degrees. Grease a 9x5 loaf pan and lightly dust it with flour.
In a large mixing bowl, mash your bananas and combine with your sugar and oil.
Add in the eggs, sour cream, and vanilla. Mix well.
Add in the cinnamon, flour, baking soda and salt.
Mix until just combined. It's okay if it's a little lumpy.
Pour the batter into the prepared loaf pan. Bake for 50-60 minutes or until a toothpick comes out clean.
Let cool for about 5 minutes before removing from the pan to finish cooling on a wire rack.