Preheat oven to 375° and grease your loaf pan. I use Pam Spray for Baking.
Melt butter. I use the microwave to speed up the process.
In a bowl combine flour, baking soda, baking powder, salt, and cinnamon.
In a bowl or mixer mash the ripe bananas. Add sugar, egg, butter, and vanilla and combine.
Slowly mix in flour mixture into the banana mixture until just moist.
Pour into greased loaf pan and bake in the oven for 30 minutes or until golden brown and cooked through.