I'm a purist on my hot chocolate. Those mixes all have dry powdered stuff which I am inclined to doubt is really milk or even chocolate. There is no doubt that the recipe I'm about to give you is hot chocolate.
Get a mug and fill it with milk. Add some cream or half & half if you have it to make it even richer. For God's sake please don't use any of that 1% stuff. Pour the milk in a pan and add a couple of squares of dark chocolate. If you don't have a bar of chocolate handy you can use chocolate chips. Heat this stirring with a wire whisk until the chocolate is melted. The chocolate doesn't dispurse easily and you might even need an electric mixer. Otherwise the chocolate will stay in tiny clumps. Add a dash of vanilla. Pour it all back into the mug.