A popular favorite in the American south--tbey're called moon pies (but without the jam--that would be a Little Debbie Jelly Creme). The northern equivalent would be a whoopie pie, more likely with a cream filling than marshmallow.

Here's Mike and the Moonpies singing "Steak Night at the Prairie Rose."

https://youtu.be/Iw62r5hUnFA

I didn't know a lot of those older songs--should have, they're great. Many thanks. I'll put up my own menu later.