1. In a medium saucepan, warm about one-third of the half-and-half or milk, with the chopped chocolates and salt, stirring until the chocolate i melted.
2. Whisk in the remaining half-and-half or milk, heating until the mixture is warmed through. Add the cinnamon.
3. Use a hand-held blender, or a whisk, and mix the hot chocolate until it’s completely smooth. Serve very warm.