We call it a Dutch Baby in this house. Not sure why, or where the recipe came from, but i make this every Saturday for my daughter:
Cast iron into a 425° oven as it preheats.
While you're waiting: -whisk 4 eggs. -Add half cup of flour. -Half cup of milk (almond, oat, whole milk all work), warmed up to room temp. -Dash of salt
Whisk until smooth. When oven is ready, pull out cast iron, add 2 tbls of butter and make sure it gets all the sides. Pour in mixture and bake 12 minutes. Turns into a billowy beautiful eggy pancake. Good with maple syrup or savory with cheese and ham.