Preheat your oven to 345F
Gather all your ingredients, measure everything then set aside.
Mash the bananas and set aside.
In a microwave-safe bowl, melt half a cup of butter. Add in eggs, and sugar. Mix everything until fully combined.
Add sour cream, and vanilla extract to the same bowl and mix.
In a separate bowl, add flour, baking soda, salt and cinnamon. Mix together using a whisk to get rid of any lumps.
Pour the wet ingredients into the dry ingredients and mix. Add in the mashed bananas and mix until everything is fully incorporated.
Using an ice cream scoop, scoop banana batter into the mini loaf pan. Fill each pan about halfway, about two scoops each.
Place into the oven and bake for thirty minutes before removing from the oven to cool.