In a small pan on the stovetop over medium heat, whisk the milk with the starch, cayenne, and sugar (is using). Whisk constantly until the mixture has thickened slightly
Turn the heat to low, then add the chocolate, stirring until completely melted and smoothly combined.
Pour into a mug and enjoy!
Notes
If you are already using a rather sweet chocolate, no need for sugar. However, if you are looking for the ultimate indulgent treat, go for that additional sugar!Cayenne isn't necessary, but is absolutely delicious provided you are not sensitive to spice. Feel free to use it or omit it - it will be delicious either way!