Add all of the ingredients in the crockpot, whisking to combine.
Cook on high for an hour or on low for 2 hours, stirring occasionally, until chocolate is completely melted, and the hot chocolate is heated through.
Switch the crockpot to low or the keep warm setting, do not keep it on high or it will burn. Stir often at your party.
Ladle the hot chocolate into mugs/cups and serve with mini marshmallows.
Video
Notes
Stove Top Directions: This can be easily made on the stove top in a stockpot! Add all the ingredients to the pot and heat until hot. Stirring occasionally - do not boil.