Banana Walnut Sponge Cake

Ingredients:
3 eggs (weighing 56g each with shell)
60g brown sugar
1 tsp vanilla extract
150 mashed banana
125g self-raising flour
10g milk powder
1/8 tsp soda bicarbonate
1/4 tsp baking powder
dash of mixed spice
1/8 tsp salt
90g coconut oil or rice bran oil
40g walnuts, chopped
5g walnuts, chopped (extra)

1. Line a loaf pan (21 x 11 x 3.5cm).
2. Sift flour, milk powder, soda bicarbonate, baking powder, mixed spice and salt together.  Set aside.
3. Beat eggs, sugar and vanilla extract until thick and pale.
4. Add in mashed banana and mix to combine.
5. Fold in sifted flour mixture.  Then gradually add in oil and stir to combine.
6. Finally fold in chopped walnuts.  
7. Pour batter into prepared pan and sprinkle extra chopped walnuts over the top of the batter.
8. Bake in a preheated oven at 160°C for an hour or until done.