In a blender, combine cocoa powder, sugar, salt, and 1 cup of whole milk. Blend until smooth.
Pour the blended cocoa mixture into a slow cooker, making sure to use a spatula to scrape and transfer every bit from the blender.
Pour in the remaining 5 cups of milk, heavy cream, and vanilla extract. Stir to combine.
Cover the slow cooker and set it to low. Cook for approximately 2 hours, stirring occasionally. The hot chocolate is ready once it’s warmed to your liking. (Don’t cook on high; this can curdle the milk.)
Once warmed, ladle the hot chocolate into mugs. Top with your preferred toppings and enjoy!
Why Dutch-process cocoa powder? This powder is treated with an alkalizing agent, reducing its acidity and bitterness while enhancing its color and flavor. It’s darker, with a smoother, more mellow chocolate flavor, and dissolves more easily in liquids, making it perfect for recipes like hot chocolate.
Here are my favorite disposable hot cocoa cups!Storage: Let hot chocolate cool, then pour into an airtight container and keep it in the fridge for 4–5 days or freeze it for up to 3 months.