Preheat oven to 350 degrees F. Spray an 8"x5" (or similar size) loaf pan with baking spray (the kind with flour in it) and set it aside.
In a large bowl, use a sturdy fork to mash the bananas until completely smooth. Stir in the melted butter.
Add in the sugar, egg, vanilla, baking soda, salt and flour and then stir with fork until the batter is thick and combined. Don't over mix, some lumps are ok. Fold in the chopped nuts and then scoop/pour the batter into the prepared loaf pan.
Bake the banana bread for 50 minutes to 1 hour, or until a toothpick inserted in the center comes out clean. Let cool in pan for about 10 minutes before removing and cool completely on wire rack. Slice and enjoy!
Notes
For a pretty presentation, sprinkle a few extra chopped nuts on top of the batter prior to baking. If the top starts to brown too much, loosely cover with foil and continue baking until cooked through.