Let milk and eggs come to room temperature, or run eggs under warm water and microwave the milk to bring it up faster. Do not use cold ingredients!

Preheat Oven to 400°F

Place butter in a cast iron skillet and place skillet in oven 

Mix eggs, milk, flour, sugar, cinnamon, and nutmeg in blender until combined (it will be the consistency of thin pancake batter or paint) 

As soon as the oven is to temperature and the butter is melted (do not let brown), pour batter into skillet 

Bake for 25 minutes 

Cut and serve immediately