While there's always a spot in my heart for hot cocoa mix or Nutella hot chocolate, my favorite hot chocolate is made using this method, involving warm milk and high-quality chocolate.
The peskiest problem most people face when making homemade hot chocolate is emulsifying (blending) the chocolate and the milk. Forget whisks or blenders — the only way to get the job done is to shake the warm milk and chocolate together in a mason jar until the mixture becomes frothy.
In literally three minutes, homemade hot chocolate is made! Feel free to stir in a little (1/4 teaspoon) vanilla or peppermint extract for an extra flavor kick. Top with marshmallows or with some whipped cream, and go cozy up by the fire.
From POPSUGAR Food
In a mason jar, combine the milk and chocolate.
Microwave for about 1 minute and 10 seconds, or until small bubbles form at the top of the milk and the chocolate appears slightly melty.
Carefully remove (you may need to do so with a towel or oven mitt). Secure the lid on the mason jar, and shake until the chocolate dissolves into the milk and becomes frothy.
Unscrew the cap, transfer to a mug, and top with the marshmallows.