Combine Ingredients. In your crockpot, add the heavy cream, whole milk, sweetened condensed milk, semi-sweet chocolate chips, cocoa powder, vanilla extract, and a pinch of salt. Stir the ingredients until well combined.
Set and Forget. Cover the crockpot and set it to low heat. Let the mixture simmer for 2-3 hours, stirring occasionally to ensure the chocolate chips are fully melted.
Serve. Once everything is melted and well combined, give it a final stir and ladle the hot chocolate into mugs.
Top and Enjoy. Add your favorite toppings, whether it's a dollop of whipped cream, a handful of marshmallows, or a sprinkle of chocolate shavings.