Preheat oven to 400F. Place butter in 9 by 13
baking pan and let it melt in the oven.
Meanwhile, mix flour, milk, eggs, and salt with
mixer. Remove pan with melted butter from the
oven and pour batter into the pan. Return the pan
to the oven for 15 to 20 minutes. The sides will
rise considerably so make sure it is in the middle
or lower section of the oven.