Preheat the oven to 375′ F.
In a large bowl, first mix all the dry ingredients without lumps: Flour, sugar, salt, baking soda.
Now add in the mashed bananas, butter, vanilla extract and egg. Mix them thoroughly to form a batter.
Then add in the walnuts and give it a complete mix.
Pour the batter into a greased bread loaf pan and smooth out the top with a spoon.
Bake at 375′ F for 1 hr. Always keep an eye on the bread while baking.
After 1 hr, allow the bread to stand inside the oven for 5-10min. Remove and let it cool.
Slice them and serve.