I viewed an in-depth youtube on the technology, and a big thing pointed out was, for good reason, the maiden voyage features the baking, but the result must be returned for analysis. There is no eating the baked cookie(s). However, to mitigate the bad publicity aspect of that, the oven goes up with earth-baked cookies for the astronauts to eat instead (for now).
The youtube was quite interesting about the various aspects of the oven... that it cannot have any fan, that it cannot work by convection, etc.
I volunteer to be on the space cookie tasting team!