Preheat Oven at 180*C/350*F.
Grease the loaf pan with some oil, dust with flour and set aside.
Peel the skin of bananas and mash it well without lumps in a bowl.
Add brown sugar, vanilla extract, oil and yoghurt to the mashed banana and whisk together.
In another bowl, sift both flours, baking powder, baking soda, allspice and salt.
Add dry ingredient mixture to wet ingredients and mix it gently. Don’t overmix.
Add chopped walnuts and give a stir.
Pour the batter into a prepared pan then smooth it out with a spatula.
Finally, sprinkle some sesame seeds and garnish with walnuts on top.
Bake for 40-50 minutes or till the skewer comes out clean.
Cool down completely before slicing.