Add all the ingredients into a pot and cook over low heat, stirring with a whisk until the chocolate is melted and everything is well combined and very warm.
Add the hot chocolate into a blender and mix for a minute or two. This is optional but very recommended. Pumpkin puree can be sometimes lumpy. Hot chocolate mixed in a blender has a smooth, velvety consistency, and the spices are perfectly distributed.
Optional: you can top your pumpkin spice hot chocolate with whipped cream and sprinkle with cinnamon sugar.
Enjoy!