Easiest recipe there is, but i would not advice on having this more than once in a blue moon, as it is very fattening.
Make yourself a very hot steamy mug of hot chocolate (using only milk, no water), and drink it till it is 3/4's full. Then, slowly empty a small packet of m&m's, or large pack, enough so that no m&ms are visible above the surface of the hot chocolate. Stir with a spoon, and then either eat the m&ms (they have an incredible favour), or let them melt. You can also drink the drink (the hot chocolate is supercharged with choc, so it tastes great).
Enjoy!
[EDIT]: i just realised this thread name is perfect for many choc recipes, so paste your favourite choc recipe in here!