My recipe sounds like it is similar to the one CarrieAnne mentioned. It is from my MIL-
Sally's Hot Chocolate
1 box (8qt size) powdered milk
1 Cup powdered sugar
4 oz Cremora
1 box on Nestle Quick powder (the recipe says large box, but I have only seen one size)
Mix it all up, add by the tablespoon (to taste) to a mug of hot water