I know the measurements aren't superb so ill put it here =P
Add your coffee first probably about 1/3 of a cup, add your milk and stir like theres no tomorrow it should be just a bit more liquidy than paste. Then add chocolate powder... the more you add the less you'll taste the coffee. Stir again! Then add boiling water.
You should get a really big energy buzz, but wont have to put up with the horrible taste of proper strong coffee so you'll be drinking it like water =D
More info on how to make a Super Strong Tasteless Coffee