Place the cast iron pan or cake pan into the Cosori Air Fryer basket.
Select the Preheat functionon the air fryer, adjust temperature to 375°F, then press Start/Pause.
Whisk the eggs, flour, milk, sugar, and nutmeg in a large bowl until well combined and smooth. There should be no lumps.
Remove the air fryer basket after preheating, keeping the cast iron pan inside the basket. Immediately add in the butter and use a spatula to spread the butter around evenly until it has melted.
Pour the batter into the cast iron pan and reinsert the basket back into the air fryer.
Set temperature to 375°F and time to 20 minutes, then press Start/Pause. The pancake will puff up and grow in height, no shake is necessary but if you would like a lighter colored topping, pause the air fryer when 5 minutes is left on the timer and tent the top of the pancake with foil.
Remove the cast iron pan, carefully with an oven mitt, when done. Turn out the Dutch baby onto a serving platter and serve at once sprinkled with lemon juice, dusted with confectioner’s sugar, and fresh berries if desired.