01 - In a small mixing bowl, combine heavy whipping cream with powdered hot chocolate mix.
02 - Whisk or beat the mixture using a hand mixer until light and fluffy peaks form.
03 - Pour chocolate milk into a microwave-safe cup and heat in the microwave for 1 to 2 minutes or until steaming but not boiling.
04 - Spoon the whipped hot chocolate mixture onto the heated chocolate milk. Top with marshmallows or shaved chocolate if desired. Serve immediately.