Chocolate Crema Catalana - the Catalan version of the French crème brûlée with a crusty burnt sugar top, but chocolate flavoured!
In a bowl, whisk together the egg yolks, sugar, cinnamon powder, and corn starch until white and fluffy.
Add the melted chocolate and keep whisking.
Add the milk, while whisking constantly.
Put the mixture on the fire and slowly and cook on a medium flame until it boils and the cream thickens. It will be quite frothy at the beginning, but the foam will disappear once it starts to boil (at this point, the crema catalana will be ready).