Preheat the oven to 350℉ and line a loaf pan with parchment paper.
In a bowl mash the bananas using a fork or a potato masher. Set aside.
In a stand mixer cream the mashed bananas, melted butter, and eggs until light and fluffy.
Add in granulated sugar and brown sugar and beat until combined.
Pour in the vanilla extract and milk until fully combined.
Sift the flour, baking soda, salt, and cinnamon in a separate bowl.
Slowly add the dry ingredients to the wet ingredients while mixing until well combined.
With a spatula stir in the walnuts.
Pour the batter into the prepared loaf pan.
Bake for 55 minutes to an hour or until a toothpick comes out clean. Cover if the top of the banana bread is becoming too brown.
Allow banana bread to cool for 10 minutes before removing for loaf pan. Slice and enjoy.