- Preheat your oven to 350°F (175°C). Lightly grease your loaf pan with butter or line it with parchment paper to prevent sticking. 
- Peel your ripe bananas and place them in a large mixing bowl. Mash them with a fork or potato masher until smooth with some lumps remaining. 
- Add melted butter to the mashed bananas and stir to combine. Mix in sugar, beaten egg, and vanilla extract until well incorporated. 
- In a separate bowl, whisk together all-purpose flour, baking soda, and a pinch of salt to evenly distribute ingredients. 
- Gradually add the dry ingredients to the wet banana mixture, stirring gently until just combined. Avoid overmixing to keep the bread tender. 
- Fold in the chopped walnuts evenly into the batter for added crunch and flavor. 
- Pour the batter into the prepared loaf pan and smooth the top. Bake for about 60 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs. 
- Let the bread cool in the pan for 10 minutes, then transfer to a cooling rack. Slice and enjoy once cooled.