I keep decaf instant coffee around just for a treat like this in the afternoon, when I don't want to make (or have) regular coffee. My cocoa mix envelope was a bit shy of 3 tbls. so I ended up using less, but it was still enough. For the powdered milk, I used vanilla powdered creamer, which added another dimension to the drink. Made for Fall 2012 PAC game.
This was wonderful for a quick brekkie this morning. Everything needed was at hand to make up. I used Splenda and Dutch cocoa for the chocolate mix. It's made in the time it takes the water to heat and give the cup a stir. Try this when you want something a little extra in your coffee.