Actually condensed milk and evaporated milk are very similar. The only
real difference is condensed milk is heavily sweetened and evaporated
milk isn't. Otherwise the process that evaporates/condenses the milk
is pretty much the same thing.

Some times evaporated milk is called condensed milk, which is correct,
because what we call condensed milk is properly called "sweetened
condensed milk".

I think the recipe the op quoted was either sloppy in it's terminology
or just plain wrong (misprint?). A quiche made with evaporated milk
should work just fine.

Cathy