Transfer the cooked cocoa into a Crockpot and keep it warm on the warm setting during the party/gathering. Remember, add the toppings to each cup when serving - don't just toss them into the Crockpot. If you see a darker coating on the surface of hot chocolate, don't worry. Just give it a good stir to mix it in. It's actually best to give the cocoa a good stir before getting each serving out.