In your slow cooker, add the unsweetened cocoa, chocolate (unsweetened or bittersweet) and sweetened condensed milk. Cook on HIGH for 30 minutes or until chocolate is melted.
After 30 minutes, using a whisk, mix ingredients and add the heavy cream.
Add 6 cups milk and pure vanilla extract and then whisk. Cook on HIGH for 2 more hours or until it's hot.
Add your favorite toppings like marshmallows, spice mixtures, syrups and top with candies, enjoy!
This recipe requires a slow cooker.
Tip: Keep a whisk close by the slow cooker so that you can mix the hot chocolate so it's smooth before serving.