1. Select recipe proportions to fit your pan. Preheat oven to 425 degrees. Make sure the oven rack in in the lower middle position (not the bottom!)
2. Place the butter or margarine in baking dish and set it in the oven until the butter is melted.
3. While waiting for the butter to melt, beat eggs until light and foamy. Gradually add milk, then flour and salt, beating well.
4. Carefully remove the baking dish from the oven and pour the batter into the melted butter. Return the dish to the oven and bake until puffy and well-browned, about 20-25 minutes.
5. Serve at once with fruit topping or syrup.