Sift the flour, add all dry ingredients (except the chopped walnut) and mix well. (leave a pinch of brown sugar for later)
Melt the butter, mash the bananas and stir all wet ingredients well.(leave some melted butter for later)
Mix both the dry and wet ingredients together.
Put parchment paper inside a loaf tray, then pour the ingredient into it. Evenly spread the brown sugar on the top (left from step 1) and squirt a line of melted butter (left from step 2) before baking it.
150 degree for 30 mins, 175 degree for 5 mins. Remove the loaf tray and leave the cake cool.
