Puffed Pancake

Directions

1. 1
   Preheat the oven to 425°F.
2. 2
   You will need a 12-inch cast iron skillet, or oven-proof skillet, and a blender.
3. 3
   In a blender at medium speed, mix together the eggs, milk, flour, granulated sugar, vanilla, and cinnamon, until just combined, about 15 seconds. The batter should be a little bit lumpy.
4. 4
   Melt the butter or margarine in a 12-inch cast iron skillet by putting it in the hot oven for about 30 seconds.
5. 5
   Remove the skillet from the oven, spread the butter to coat the bottom and sides of the skillet, and pour in the batter.
6. 6
   Return the skillet to the center oven rack and bake for about 20 minutes, or until the pancake is puffed and lightly browned. Note: (Do not check before 17 minutes have passed and close the oven door slowly and carefully after checking).