How to Make It
Place the chocolate chips and the sugar in a heat-resistant bowl.
Heat the milk in a medium saucepan to very hot but not boiling.
Take a ladle of hot milk and pour over the chocolate and sugar. Whisk until smooth and melted
Now, add the chocolate sauce to the remaining milk in the sauce pan. Heat the mixture for a few more minutes until it simmers and whisk occasionally.
If you are using the marshmallows for garnish in your hot cocoa, reduce your sugar accordingly to 1 1/2 tablespoons.