Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a mixing bowl, mash the ripe bananas with a fork until smooth.
Stir in the melted butter until well combined.
Add the baking soda and pinch of salt to the banana mixture, mixing well.
Incorporate the sugar, beaten egg, and vanilla extract.
Gradually add the flour, stirring until just combined.
Fold in nuts or chocolate chips, if desired.
Divide the batter evenly among the muffin cups, filling each about 2/3 full.
Bake in the preheated oven for 20-25 minutes or until a toothpick comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack.