in a 3 1/2 to 4 quart slow cooker, mix milk, half and half, chocolate pieces, coffee powder, 1 teaspoon cinnamon, and ground chipotle Chile pepper.
Cover and cook on low heat setting for four hours or on high heat setting for two hours, whisking vigorously once halfway through cooking time. Whisk well before serving. If desired, garnish each serving with whipped cream and sprig with cinnamon. Makes 12 servings.