Method
Preheat oven to 350°F (175°C) and grease a loaf pan.
Mash bananas in a large bowl until smooth.
Mix in melted butter, sugar, eggs, and vanilla.
Add self rising flour and mix gently until combined.
Fold in walnuts.
Pour batter into loaf pan.
Bake for 50–60 minutes or until a toothpick comes out clean.
Cool before slicing and serving.