Preheat the oven to 350°F (175°C).

Grease your loaf pan with butter or non-stick spray.

Mash the ripe bananas in a mixing bowl until smooth.

Add melted butter to the mashed bananas and mix well.

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

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

Gradually add the dry ingredients to the wet mixture, folding gently.

Gently fold in the chopped walnuts until evenly distributed.

Pour the batter into the prepared loaf pan.

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

Let the bread cool in the pan for a few minutes before transferring to a wire rack.