Whisk 2 cups of milk, 2 tablespoons of unsweetened cocoa powder, 2 tablespoons of sugar, ½ teaspoon of ground cinnamon, ¼ teaspoon of vanilla extract, and ⅛ teaspoon of chili powder in a saucepan.
Add 30g of chopped bittersweet chocolate. Heat over medium heat, stirring, until the chocolate melts and the drink is steaming; do not boil. Pour into mugs and serve.
