If you only plan to make a single cup, save the ganache base in a sealed container in your fridge up to two weeks. When you want to make more, simply scoop out what you need and add it to a mug, then pour steamed milk over it and stir.
Feel free to add cinnamon and cayenne or nutmeg to the ganache based once the chocolate comes together for additional flavor. You don't need more than 1/4 to 1/2 teaspoon, but it's a great add.
For more tips and tricks, be sure to read the full article above.