Place a 9 inch skillet in the oven and preheat to 450° F.
Heat the milk in the microwave for 20 seconds.
In a medium bowl beat the eggs, then stir in the milk
Slowly whisk in the flour and salt until smooth
Carefully remove the skillet and add the butter to coat the inside
Add batter to the skillet and place it back in the oven. Bake 12-14 minutes, or until browned and puffy.
Serve plain or add toppings as desired.