Make sure the heating attachment is in place in the frother.
Add all ingredients to the frother. Place the lid on tight. Push the "on button" and allow cocoa to mix.
Add the hot cocoa to a mug. Top with a dollop of whipped cream, if desired.
Video
Notes
To make on the stovetop: add all ingredients to a sauce pan. Over medium low heat, whisk continuously until everything is smooth and hot, about 10 minutes.The microwave is not recommended.