Double cheeseburger has always had and still has two slices of cheese. The McDouble (which used to be $1) always had a single slice of cheese. The real hack wa

Double cheeseburger has always had and still has two slices of cheese. The McDouble (which used to be $1) always had a single slice of cheese. The real hack was asking them to put Big Mac sauce on the McDouble. For $.30 it was pretty damn close at 1/3 the price.