Preheat your oven to 350°F (175°C).

Grease a loaf pan with butter or cooking spray.

In a mixing bowl, mash the ripe bananas using a fork or potato masher.

Add the melted butter to the mashed bananas and mix well.

In another bowl, whisk together the baking soda and salt with the flour.

Add sugar, beaten egg, and vanilla extract to the banana mixture and stir until combined.

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

Gently fold in the chopped walnuts.

Pour the batter into your prepared loaf pan.

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

Remove the bread from the oven and let it cool in the pan for about 10 minutes.

Transfer the bread to a cooling rack to cool completely before slicing.