Pretty sure I saw this Twilight Zone episode (”To Serve Man”).
On the other hand, I look at some of the policies the Elites want us to take and it seems like a path to either extinction or de-evolution. As a flight of fancy, I often wondered if we weren’t doing it at the behest of some Alien race. The deal may be: Kill yourselves slowly & relatively painlessly or we will kill you quickly and violently.
It really WAS a cookbook.