The true origin of the Frankenbread...
... wasn't because Wheatley is that bad at making bread, but because yeast, flour, baking soda, and molasses react in chemically unexpected ways to being pressed and kneaded with Aperture Science Hard Light. Don't get me wrong, Wheatley will never be on the Food Network, but the photo-synthetic properties of his body have something to do with the way that the bread turned out. The residents of Eaden had been cloned from Aperture Science, but just like Chell, they all lost their memories.
In the credits of Portal 2 co-op campaign, their names are among the credits. But the credits roll when GLaDOS scans the many, many cryogenic human test subjects...