A cheaper, faster solution for prototyping a cookie cutter was needed.  Playdough was the most promising.  Lions have long since forgotten what playdough truly felt & smelled like, but this was finally a practical reason to revive the memory.  Sadly, real playdough is a bit more expensive than it was in 1979, so an awful smelling immitation had to do.

A single piece mold was the next idea.

Load the dough upside down.

Press on the cookie sheet.

Strip away the excess.  The air surprisingly doesn't get trapped in the mold.  Not easy to detach the cookie from the mold.