I found a hot chocolate recipe on the back of my powdered milk and made it this week, and it is pretty good.
It is just 2 cups Nonfat Milk Powder
1 Cup sugar
1/2 cup cocoa powder (unsweetened)
1.25 t salt.
Just mix 1/4c of the mixture into 1 cup of boiling water.
Great with those little marshmellows. :)