In a mixing bowl beak open an egg to this add in Brown sugar, Vegetable oil and buttermilk.
2.Next add in the Vanilla essence and mashed banana.
3.Mix everything well together. In another bowl sieve in all-purpose flour.
4.To this add in baking powder, baking soda and salt. Sieve everything together. So that they mix evenly. Next add in the dry ingredients to the wet ingredients slowly in batches. Add in ¼ cup of coarsely ground walnuts. Fold everything together.
5.Line a muffin tray with liners. To this scoop and add in the prepared batter. Add in a generous serving of coarsely ground walnuts over the muffins. Preheat the oven at 180 Deg C for about 10 mins and then bake at 180 Deg C for about 20 mins. check if a toothpick when inserted comes out clean and then remove from the oven. Allow it to cool completely and then serve