Take 1 peeled banana in a bowl and mash it well with hands to make it a paste.

Add oil,vanilla sugar to it and mix well. Mix 3/4 cup all purpose flour,1/2 Tsp baking powder,1/2 Tsp baking soda in another bowl with a whisk.

Pour the banana mixture in the flour mixture.  Fold gently, don't beat. Add chopped walnuts to it, reserve some for sprinkling on the top

Fill 3/4 muffin/cupcake mould and sprinkle remaining walnuts. Bake for 30 min.in pre heated microwave @190°