Banana Sponge Cake

Ingredients:
2 cup all-purpose flour
1/2 teaspoon baking soda
1 teaspoon baking powder
1 cups castor sugar
6 eggs
1 1/2 cup mashed banana ( 6-7 medium size banana)
2/3 cup canola oil
1 teaspoon vanilla extract
1/2 cup chopped walnut - Optional (I use almond)

Method:
1.Preheat oven at 160C.
2.In a bowl sift the flour. In another bowl mix the eggs, vanilla extract, sugar, mashed banana and mix until ribbon stage.
3.Add the flour mix to the egg and banana mix, mixing gently. Once the flour has been incorporated, add the walnut and the oil.
4.Pour into the prepared muffin cup and bake for approximately 25-30 minute at preheated oven or until an inserted wooden pick comes out clean.