Combine the first 6 ingredients in a medium sauce pan over medium-low heat. Stir with a whisk and simmer for about 15 minutes or until the chocolate chips have melted and all of the ingredients are thoroughly combined. Give the mixture a stir with your whisk every 2-3 minutes while it simmers.
Serve each mug with a candy cane and top with a handful of mini marshmallows.
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