I have a precise method for making a box of macaroni and cheese: I boil the water, cook the macaroni for a couple minutes shy of the package instructions, drain it, then return the noodles to the pot and add the butter, stirring so it melts over the mac. I then sprinkle in the cheese powder, and stir again to dissolve…
source https://skillet.lifehacker.com/upgrade-your-boxed-mac-and-cheese-with-browned-butter-1846355433