Preheat the oven to 180°C. Line a loaf tin 9"X5" with some parchment paper.
Sift the flour, baking powder, baking soda, cinnamon powder and salt together into a mixing bowl.
Add oats and nuts to the flour mixture. Mix well.
In another bowl add the sugar, eggs, oil, vanilla extract, yogurt and mashed banana. Whisk well.
Add flour mixture to the liquid mixture and mix gently till the flour becomes wet. Do not over mix.
Pour the batter into the prepared tin.
Sprinkle the top with some oats.
Bake for 40-50 minutes. Bake till the top appears golden brown.
A skewer or toothpick inserted in the middle of the loaf should come out clean if the bread is baked.
Leave the bread in the tin to cool for 10-15 minutes.
Remove from the tin. Cool the bread on a wire rack.
Slice and serve with some butter, marmalade or jam. Or enjoy it on its own.