I'm avoiding wheat so using rice macaroni for macaroni & cheese ... I just melted butter, added the cooked macaroni, added milk, then scattered the cheese powder over the mixture just like macaroni & cheese that comes in the box;  the powdered cheese melted into a sauce with the milk and butter so now I can have macaroni and cheese ... aaah!  So much regular cheese these days melts into stringy goop, this stuff is great to have around for cheesy sauces.