Chop tablet of Ibarra into blocks for easier melting. Then warm the chocolate, chile, milk, and dash of salt in a small saucepan. Heat until the chocolate is melted–should be quite hot (although not boiling).
Froth with a hand-blender (or blend in a blender) until the bits of chocolate are completely dissolved and the top becomes foamy. Top with whipped cream and cinnamon and drink immediately.