Prepare a mug of your preferred hot chocolate (dark or milk both work well); use milk, not water. When you mix in the cocoa, add:
1/4 teaspoon ground cinnamon
A little finely-ground cayenne pepper; you can use as little as a pinch or a much as an eighth of a teaspoon, depending on your spice tolerance.
Mix it all together with a whisk (this works so much better than a spoon or a fork). Drink.