Mix together the semi-sweet chocolate chips and the white chips in a small bowl, set aside.
Add the layers down evenly into a ½ pint wide neck canning jar, starting with the sugar and ending with the chocolate chip mix. Place the lid on, and decorate if desired. Don't heap any of the measurements or you won't be able to get the lid on. Add a handwritten label with instructions.
To prepare the hot chocolate:
Slow Cooker: In a 5-quart or larger slow cooker, add the contents of the gift jar and a ½ gallon whole milk. Stir, cover and cook on HIGH for about 1.5 hours until warm and everything is melted completely, stirring occasionally.
Stove-top: In a large pot, add the contents of the gift jar and a ½ gallon of whole milk. Heat on medium-high heat until warm and everything is melted completely, stirring occasionally.
Nutritional values are approximate. Please use your own calculations if you require a special diet. The values below are for 1/8 of the recipes and include the milk.