In your crockpot, combine whole milk and heavy cream.
Add semi-sweet chocolate chips and unsweetened cocoa powder.
Stir in sugar, vanilla extract, and salt.
Set the crockpot to low heat and cover.
Cook for 2-3 hours, stirring occasionally.
Once melted and combined, whisk until smooth.
Taste and adjust sweetness if necessary.
Serve hot, topped with whipped cream.
Garnish with chocolate shavings or marshmallows.
Enjoy the cozy warmth with family and friends!