Chop and mash one over-ripe banana to get 1/4th cup of banana puree.
Preheat the oven to 180 degrees Celsius.
Grease the loaf pan evenly with oil or line it with parchment paper.
Add Nutella, vanilla extract and banana puree in a mixing bowl and whisk until smooth.
Add the flour and whisk until blended.
Add chopped walnuts and give a quick stir.
Pour the batter in loaf pan and Bake at same temperature for 12 to 15 minutes.
Set on a wire rack to cool completely. Enjoy them with your family and friends..
Add 2-3 tbsp of milk if you feel the batter is too thick.