Add the milk that you're using to the slow cooker, followed by cacao powder, chocolate chips, sugar, and vanilla and whisk until well combined.
Cook for 2-3 hours on low setting, but keep checking every hour and give it a quick mix.
Once it's done, add the marshmallows and allow them to melt a little. Keep on the "keep warm" setting, ladle into mugs, and top with your favorite toppings.
- Store leftovers in the fridge in airtight container or bottle. Reheat over the stovetop in a saucepan, or in the microwave.
- Hot chocolate topping ideas: Crushed candy canes, pretzels, mini cookies, extra chocolate chips (white, milk, dark, cinnamon), mini marshmallows, peanut butter, sweetened coconut shavings, whipped coconut or dairy cream, caramel or chocolate syrup, sprinkles.
Calories: 136kcal | Carbohydrates: 21g | Protein: 6g | Fat: 4g | Saturated Fat: 3g | Cholesterol: 8mg | Sodium: 69mg | Potassium: 278mg | Fiber: 2g | Sugar: 18g | Vitamin A: 298IU | Calcium: 193mg | Iron: 1mg