Lemon Curd Cupcakes

I got a Hummingbird Bakery cookery book for my birthday, and this recipe is my version of their cupcake recipes

Ingredients (makes 20)

For the cake:
70g unsalted butter, softened
210g plain flour, sifted
250g caster sugar
1 tbsp baking powder
210ml milk
2 eggs
Zest of 1 lemon

For the icing:
250g icing sugar, sifted
160g unsalted butter, softened
1 tbsp milk
2 tsp lemon juice

Approx 60g lemon curd for filling

* heat oven to 170C
* put the flour, butter, sugar, baking powder and lemon zest in a big bowl and beat together with an electric mixer until the mixture looks like crumbs
* mix the eggs and milk together, then slowly beat into the flour mixture until it is smooth and free of lumps
* spoon the batter into muffin cases. I use my smallest measuring cup to portion out the mix so the cakes are all evenly sized
* bake for 20-25 minutes or until the cakes are golden brown and springy to touch
* leave on a wire rack until completely cool
* put the icing ingredients into a big bowl and whisk together with an electric mixer until well combined, light and fluffy
* with a sharp knife, cut a hole in the top of each cake. Fill the hole with a couple of grammes of lemon curd then replace the plug of cake to seal the hole
* top each cake with the icing