If you’d like to make a Hot Chocolate in a slow cooker and keep it warm for hours, follow the instructions below. 1. Place the whole milk, half and half, white chocolate chips, pumpkin puree, brown sugar, pumpkin pie spice, cinnamon, and allspice in a slow cooker. Stir everything together and then set on low. 2. After 45 minutes, open the slow cooker to stir the melted chocolate until thoroughly combined with the rest of the ingredients. 3. Let the hot chocolate cook in the crockpot for 2 hours and stir every 45 minutes. You can keep it in the crockpot for hours, on low, serving it as needed throughout the day. It works great for potlucks and sledding parties!