Steph's German Pancakes

Wow! I can't believe these aren't on here already! I make them once a semester - soooo yummy! (but also, I cut the recipe in 1/2 when I do - I think my pans are a little smaller than Steph's)

1/2 c. salted butter (oil & margarine don't work)
6 eggs
1 c. flour (unbleached or all purpose)
1 c. milk
1 tsp salt

While oven is preheating to 425, melt butter in a rectangle pan in the oven. mix rest of ingredients. Once butter has melted, pour in with remaining ingredients & mix. Pour mixture into pan & cook for about 15 min.