Well, I knew that somehow I'd screw this up.
A fool-proof recipe:
1 cup flour.
2 cups milk.
Bake at 350 for 1 hour.
What happened? The egg separated from the rest of the batter, and it looks like a Spanish tortilla. (I also threw in some pine nuts that the kids had left uneaten on their plates). Tastes ok, but I don't know what Swedish pancake is supposed to taste like. The kids saw it and said "huevos!" and peeled off the egg layer to eat first.
T's explanation: the cast iron takes a while to heat up so the elapsed time allowed the egg to separate while in the oven. Of course he used fancier words like "thermal mass" blah, blah, blah. I love my cast iron. They take my abuses without complaints. Next time I'll pre-heat the skillet. :)