The Dutch Baby is an Americanized pancake that really seems to be invented by a restaurant in Seattle, Washington during the early to the mid-20th century.
In the meantime, add the milk, eggs, melted butter, flour, salt, and vanilla to a blender and blend on high for 20 to 30 seconds or until very smooth. Set it aside.
Immediately pour in the batter from the blender and bake at 400° for 20 minutes or until browned, firm, and the batter has crawled up the sides of the pan.