Break chocolate into a heat proof bowl and suspend over a pan of barely simmering water. Stir until melted.

Spoon a little of the chocolate into the base of a skull shaped chocolate mould and pop in the fridge for 10 minutes to harden.

Take a small ball of marzipan and shape into a flat oval shape. Place in the 'brain' area of the skull mould.

Fill the remainder of each well with melted chocolate and pop back into the fridge until hardened.