Preheat your oven to 350°F (175°C) and grease your loaf pan.
In a mixing bowl, mash the ripe bananas with a fork until smooth. Incorporate the melted butter into the mashed bananas.
Stir in the baking soda and a pinch of salt.
Add the sugar, beaten egg, and vanilla extract. Mix until well combined.
Gradually add the flour to the banana mixture and stir until just incorporated. Be careful not to overmix. If desired, fold in walnuts or chocolate chips at this point.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for about 60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the banana bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.
For extra flavor, consider adding 1 teaspoon of cinnamon or nutmeg to the batter before baking.
Store cooled banana bread in an airtight container at room temperature for up to 4 days, or freeze for longer storage.