Durian Butter Cake

For some reasons I make this cake into small cup cakes.

Recipe

Ingredients:
4 oz. butter
6 oz. caster sugar
5 oz. plain flour
1 teaspoon baking powder

5 nos. egg whites
7 nos. egg yolks
150 g durian puree

Method:
1)Beat buter until soft. Leave aside.
2) Beat egg whites and sugar together until stiff and fluffy. Then add in egg yolk one at a time until well incoporated.
3)Fold in flour and the softened butter.
4) Stir in durian puree, mix well until all combined.
5) Pour into a greased and lined 8"x8" cake tin.
6) Bake in a preheated oven at 180°C for 45 minutes or until cooked.