Step 1

In a medium slow cooker, whisk together the heavy cream, whole milk, sweetened condensed milk, cocoa powder, and vanilla extract. Note: the cocoa will likely not mix in well, but it will incorporate into the liquid during the heating.

Step 2

Stir in the chocolate chips.

Step 3

Set the slow cooker to low and cover. Heat for two hours, stirring occasionally.

Step 4

Serve hot in mugs with topping of your choice.