4 cups whole milk 2 tablespoons sugar 2 tablespoons plus one teaspoon unsweetened cocoa powder 4 tablespoons finely chopped chocolate Vegetable oil or cooking spray Large marshmallows Preparation : Bring milk, sugar, cocoa powder, and chocolate to a simmer in a medium saucepan over medium heat. Stir until chocolate has melted then pour into mugs. Float your marshmallows on top and enjoy.