I don’t remember the drizzling with butter (that mean they are healthy [;)]) but the rest could be it. I’ll have to play around.
the butter probably helped the corn flakes to bond to each other to create the crust to hold the creamy stuff in. Otherwise, the cornflakes would absorb to sour cream/mayo mixture.
I’ve tried searching for this recipe too. So far, no luck, I emailed my mom to see if she’s heard of it, but I haven’t heard back yet. (My Mom knows a ton of those older classic dishes.)