Heat up 1 cup of milk in a saucepan or the microwave until warm but not boiling. Mix in the cocoa powder and stir until that dissolves.
In your Crock Pot, add the cocoa powder milk, regular milk, heavy cream, sweetened condensed milk, chocolate chips, vanilla extract, and a pinch of salt.
Cover and set to low heat for 2 hours. Stir occasionally to help the chocolate chips melt evenly.
After 2 hours, whisk the hot chocolate to make sure everything is well combined and smooth. Reduce the setting to “keep warm” if you’re serving over time.
Ladle into mugs and top with whipped cream, marshmallows, or a sprinkle of cinnamon!
