preheat oven to 350F
mash 3 ripe bananas in a bowl
mix in 1/3 cup softened butter (or coconut oil) + 1/3 cup granulated sugar + 1/3 cup brown sugar + 1 tsp vanilla
whisk in 1 egg
add in 1 1/2 cup all purpose flour + 1/2 tsp baking soda + 1 tsp cinnamon
pour batter into a lined loaf pan and sprinkle cinnamon sugar on top
bake for 1 hour or until toothpick comes out clean