Pre-heat oven to 350.

Beat room temperature butter & brown sugar in a stand mixer for 2 minutes.

Once fully combined, add in three mashed bananas. Mix again

Then add in the egg, & vanilla extract.

In a separate bowl, whisk together flour, baking powder, and baking soda. Then fold into the wet batter.

In a separate bowl, mix together the cinnamon & sugar.

Scoop half of the banana batter into a greased minimuffin pan.

Bake for 12-14 minutes.

Once slightly cooled, toss in melted butter, then in the cinnamon sugar mixture