That's really all it is, a baked custard. Surprisingly easy to make:
Heat oven to 425
Add 3 eggs, 1/2 cup of flour, 2/3 cup of milk, spoonful of vanilla extract, shake of cinnamon, and a shake of salt to a blender.
Blend until smooth.
Put your cast iron skillet on the stove on high, then add 3 tablespoons of butter and melt completely. Turn burner off and pour the contents of the blender into the pan from the center.
Bake for 20-30 minutes. Mine took 25, but my oven runs hot.
After it came put, I topped the whole thing with some melted butter and sprinkled a little bit of sugar on top. Usually served like a pancake with syrup of fruits on top. Recipe was courtesy of a site called "Foodwishes", but I tweaked it with more vanilla, and cinnamon. The original also called for powdered sugar, which I didn't have.