In your slow cooker, pour in 6 cups of whole milk and add 2 cups of heavy cream along with 1 can of sweetened condensed milk. Stir gently to combine these creamy ingredients until they are well mixed.

Next, sprinkle in 2 cups of semi-sweet chocolate chips, then add 1 teaspoon of vanilla extract and a pinch of salt. Whisk or use a spatula to ensure that the chocolate chips meld seamlessly into the creamy mixture.

Cover the slow cooker and set it to low heat for about 2 hours, stirring occasionally, until the chocolate chips have melted and the mixture is smooth and creamy.

Once the chocolate is velvety and hot, switch the setting to warm for serving. Stir again before ladling into mugs.

Get creative with toppings such as whipped cream, mini marshmallows, crushed peppermint, or chocolate shavings.