Bake in a 9 x 13" baking dish.
Pre-heat oven to 450 degrees. This is a MUST.
Place butter in the baking dish. Bake in the oven until melted.
While the butter is melting, get your batter ready. In a large bowl, beat eggs until light and frothy. Add milk and flour beat well.
Pour batter directly into hot pan that has the melted butter in it. The butter will rise up over some of the batter (as shown in the pictures). This is normal.
Bake 20-25 minutes in 450 degree oven until golden brown and completely puffy on the sides.