It’s the infamous Lemon Bars & Lemon squares! As seen in who knows how many community cookbooks over the years. This variation came from The Wanderers: Assumption Church Folk Group 1984.
No discussion or posting of a recipe variation can happen without a callout to Just Hood who originally posted on reddit.
I was tempted to write a long story about how when my great-great-grandmother was a girl she smuggled this Creamed Cabbage Soup with Kolbasz (Kaposzta Leves Fustolt Kobassza) recipe out of Hungary by sewing a copy of this in the hem of her skirt. That didn’t happen. For one thing, my grandmothers were variations of the German/ Polish/ Swiss theme. For another? I got this from a church cookbook which is freely available at Archive.org.