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I'm kinda surprised that I didn't find a Southern version of this, BP, but virtually every reference to it cites San Francisco. One interesting variation was to use it (with breadcrumbs) as the filling in a very Celtic-like pie.
Delete the hamburger, add equivalent weight of bacon, and you've got one version of a Florentine omelet. I usually add 1/2 pkg. of Neufatchel cheese, or sometimes ricotta, instead of parmesan, and I delete the Tabasco sauce in favor of creamy horseradish. I make the bacon/onion/spinach filling in one skillet, get the eggs going in an omelet pan, add the cheese to omelet after flipping, cover with the filling.
A tiny bit more effort, but it solves the appearance issue entirely.
I had it all the time growing up...the deluxe version at the SF restaurant adds mushrooms. Dumping Miracle Whip on it would be sacrilege. I never had American chop suey (yeah, I know, rendundant) until my freshman year in MA.