Preheat the oven to 350°F (175°C).

In a mixing bowl, mash the ripe bananas with a fork until smooth.

Add the melted butter to the mashed bananas and stir until combined.

Stir in the beaten egg and vanilla extract until well mixed.

In a separate bowl, mix together the baking soda, salt, and flour.

Fold the dry ingredients into the wet mixture until just combined.

Pour the batter into a greased loaf pan, smoothing the top with a spatula.

Bake for 60 minutes or until a toothpick inserted in the center comes out clean.

Allow the banana bread to cool in the pan for 10 minutes before transferring it to a wire rack.