Make sure 12 of the Creme Eggs have been put in the freezer for a few hours to freeze solid
Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, line a muffin tin with cupcake cases
To make the sponge, cream together the butter and the caster sugar, ideally with an electric mixer
Add the eggs and milk, and whisk in
Whisk in the self raising flour and cocoa powder gently
Place a teaspoon of batter into each case, then add a frozen Creme Egg. Add about 2 more teaspoons of batter around the Creme Eggs, until all the batter is used up
Bake for 20 minutes
Make the buttercream by mixing the icing sugar, butter and vanilla extract together until smooth. Use an electric whisk for best results. If the buttercream is too stiff then you can add a little milk to it
If you'd like to colour the buttercream, put half of it in a bowl and mix in some orange food colouring
Fill a piping bag fitted with a round nozzle, with the vanilla buttercream on one side and the orange coloured buttercream on the other side
When the cupcakes are fully cool pipe some buttercream on top and place a Creme Egg, cut in half, on top
Store in an airtight container in a cool place, eat leftovers within 3 days