Preheat your oven to 175°C (350°F) and generously grease a loaf pan.

Mash the ripe bananas in a large mixing bowl until smooth.

Combine the mashed bananas with melted butter, sugar, egg, and vanilla extract, stirring until smooth.

In another bowl, whisk together the all-purpose flour, baking soda, and salt.

Gradually add the dry ingredients to the wet ingredients, stirring gently until just combined.

Fold in the chopped walnuts.

Pour the batter into the prepared loaf pan and bake for 40-50 minutes, or until a toothpick comes out clean.

Let the loaf cool in the pan for about 10 minutes before transferring it to a wire rack.