In a bowl, combine the whole milk powder, powdered sugar, cocoa powder, and a pinch of salt.
Mix the dry ingredients thoroughly until they are well blended.
For each mug of hot chocolate, measure out about one third of a cup of the mixture.
Heat milk or water, then stir in the measured mixture until it is fully dissolved.
Serve the hot chocolate in a mug and, if desired, sprinkle a little extra cocoa powder on top.
