Preheat oven to 425 degrees F. Once hot, place the butter in a 10-inch nonstick skillet. Place the skillet in the oven on the center rack until the butter melts.
Meanwhile, add the eggs, flour, milk, Parmesan and seasoning into a blender. Blend on high until smooth.
Remove the skillet with the melted butter from the oven. Carefully pour the egg mixture (batter) into the hot skillet.
Bake for 15 minutes, until very puffy and golden brown.