Start by mashing your ripe bananas in a mixing bowl until mostly smooth.
2 Ripe Bananas
Whisk in the brown sugar, egg, melted butter, and vanilla until the mixture is well combined.
1/4 cup Brown Sugar, 1 large Egg, 1/4 cup Butter, 1 tsp. Vanilla Extract
In a separate bowl, stir together the flour, baking soda, baking powder, cinnamon, and a pinch of salt.
1 cup Flour, 1/2 tsp. Baking Soda, 1/2 tsp. Baking Powder, 1/2 tsp. Cinnamon, 1/4 tsp. Salt
Then gently fold the dry ingredients into the wet mixture just until everything comes together.
Use a small cookie scoop or spoon to fill the wells of your greased donut hole pan, then bake at 350°F for about 15 minutes, or until the tops are set and lightly golden.
While they cool slightly, melt a little butter and pour it over the warm donut holes in a large bowl, tossing gently to coat.
2 tbsp. Butter
In another small bowl, mix together cinnamon and coarse sugar, then roll each butter-coated donut hole in the mixture until covered.
1/2 cup Sugar, 1 tsp. Cinnamon