Scatter toppings over chocolate, over entire pan or, if using multiple toppings, in rows or another pattern. Let sit at room temperature 15 minutes, then refrigerate until cold. Bark can be broken ...
Reserve one square of the chocolate for decoration and put the rest in a medium heatproof bowl and either melt in a microwave on HIGH for about 1–1½ minutes, or place over a saucepan of gently ...
Add the chocolate and melt slowly, stirring occasionally, until very smooth. Remove the bowl from the heat. Bring the milk, cream and sugar to the boil in a saucepan over a medium heat ...