Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, and line a cupcake tin with cupcake cases
For the cupcake sponge, mix together the butter and caster sugar, ideally using an electric mixer, until smooth and fluffy
Add the eggs and milk and whisk them in well
Then gently whisk in the self raising flour, desiccated coconut and cocoa powder
Divide the mixture between the cupcakes cases, and bake them for 20-25 minutes or until a skewer inserted in the centre of the cupcakes comes out clean. Put them on a rack to cool completely
Make the buttercream by mixing together the softened butter, cocoa powder and icing sugar, then add the coconut extract and milk, and mix until smooth. You can do this by hand, but an electric whisk or stand mixer with paddle attachment will provide the best results. If the buttercream is too stiff, you can add a little more milk
Spread or pipe the buttercream on top of the cupcakes
Decorate with the Bounty bars and desiccated coconut
Store in an airtight container in a cool place and eat within 3 days