As found on The Kitchn.com

INGREDIENTS
1/2 cup 
all-purpose flour
1/2 cup  whole or 2% milk
2 large eggs
2 tablespoons sugar
1 teaspoon vanilla extract
1/2 teaspoon fine salt

1/4 teaspoon cinnamon
2 tablespoons unsalted butter
Powdered sugar, caramel sauce, maple syrup, and jam, for serving

Place the flour, milk, eggs, sugar, vanilla, cinnamon and salt in a blender or food processor fitted with the blade attachment. Blend for 10 seconds, scrape down the sides, and then blend for another 10 seconds. The batter will be quite loose and liquidy.

 Leave the batter in the blender and set aside to rest 20 to 25 minutes. This gives the flour time to absorb the liquid.

Meanwhile, place the skillet you're using on a middle rack to warm along with the oven. Heat the oven to 425°F.

When ready to make the pancake, remove the skillet from the oven using oven mitts and place it on top of the stove. Add the butter and swirl the pan to melt the butter and coat the bottom and sides of the pan.

Pour the batter on top of the butter. Tilt the pan if needed so that the batter runs evenly to all sides. Place the skillet in the oven.

Bake until the Dutch baby is puffed, lightly browned across the top, and darker brown on the sides and edges, 15 to 20 minutes.

You can either serve from the pan or transfer the Dutch baby to a serving platter. Dust with powdered sugar. Cut into wedges and serve with caramel sauce, maple syrup or jam.