Prepare the bananas. Let them ripen until mottled with black spots. Wash them well, cut off both ends and freeze at least overnight. Defrost.
Weigh the bananas and put them into a Cuisinart. Puree until they are a smooth paste.
Put the bananas in a mixing bowl. Add the granulated sugar, egg, vanilla extract, and melted butter to the bowl and mix well.
Mix the dry ingredients together and add to the batter. Mix only to incorporate.
Deposit the batter in a non-stick or sprayed 8×4-inch loaf pan.
Bake in a preheated oven for 40 minutes.
Insert a tester into the center of the banana bread to check for doneness.
Allow the loaves to cool completely before slicing or freezing.