Well, in my search for the best way to make homemade evaporated milk; it seems like there are basically two ways: either with whole or low fat milk, cooked down to 1/2 it's volume, or reconstituted dry powdered whole milk dry powder or low-fat dry powder milk cooked down to 1/2 it's volume OR mixing up a batch of whole powdered milk, using twice as much powdered milk than called for. All of these ways work. The consensus SEEMS to be that boiling the whole milk down is the best tasting...but both opinions are plentiful out there! I've used the non-cook down method. It works great!!!