Preheat your oven to 425°F (220°C). This high temperature is crucial for creating the puffiness of the Dutch Baby.
Place the cast iron skillet in the oven as it preheats. This will help the butter melt evenly and create a beautifully browned crust.
In a mixing bowl, combine the 3 large eggs, 1 cup all-purpose flour, 1 cup whole milk, 2 tablespoons cane sugar, 1 teaspoon sea salt, and a pinch of nutmeg. Whisk until the mixture is smooth and free of lumps.
Once the oven has reached temperature, carefully remove the hot skillet. Add the 2 tablespoons unsalted butter to the skillet and swirl it around until melted and bubbly.
Quickly pour the batter into the hot skillet over the melted butter. Don’t worry if it seems a little uneven; it will smooth out in the oven.
Return the skillet to the oven and bake for 20-25 minutes, or until the edges are golden brown and the center is puffed up.
Once baked, remove the Dutch Baby from the oven. Dust with powdered sugar and serve with fresh berries on top. Cut into wedges and enjoy the fluffy goodness!