Lemon Yoghurt cupcakes with lemon frosting

<ingredients> make 12 servings

125g softened unsalted butter

125g sugar

3 eggs, separated 

1tbs finely grated lemon zest

2tbs lemon juice, plus extra 2tsp for the frosting 

180g plain flour

1tsp baking powder

200g plain yogurt

1/3cup (55g) icing sugar

<How to make>

1) beat the butter and sugar until pale and fluffy. Add egg yolks one at a time, beat well. Mix in lemon zest and lemon juice. Blend well.

2) sift flour and baking powder together. Fold into mix, alternating with yoghurt.

3) whisk egg whites in another bowl until firm peaks. Then fold into the mix, fill cases.

4) bake 180degree C for 30mins or until cooked.

<Lemon Frosting>

Mix the icing sugar with the remaining lemon juice until thickened. Spread some on the cupcakes and serve.