Preheat oven to 350 degrees.
Grease a loaf pan with either cooking spray or butter
In a large mixing bowl, mash the ripe bananas with a fork until completely smooth.
Add the melted butter to the banana mixture and stir.
Mix in the sugar, beaten egg, and vanilla extract.
Next, mix in the baking soda, salt, and flour. Do not over mix.
Pour the batter into your prepared loaf pan.
Bake for 50 minutes to 1 hour at 350°F or until a tester inserted into the center comes out clean.
Remove from the oven and let cool in the pan for a few minutes before removing the banana bread to a wire rack to cool. Use a bread knife to slice the bread and serve.