Preheat the oven to 350°F (180°C).
Peel and thaw frozen bananas in a microwave. Reserve all the juices and everything.
Prepare two 9×5-inch bread pan and spray with non-stick cooking spray.
In a large (4qt) bowl, mash the thawed bananas with a fork or potato masher until mostly smooth. Add sugar, melted butter, eggs and vanilla extract. Using a wooden spoon, mix everything until combined.
Then add flour, baking soda, baking powder and salt. Mix to combine.
Optional, add chopped pecans and/or other add-ins, like chocolate chips, dried fruits.
Divide the batter evenly into the prepared pans.
Bake for 60 minutes, or until the inserted toothpick comes out clean. Cool completely before serving.