Combine the eggs, milk, flour, sugar, salt, and vanilla in a blender. Blend until completely smooth and lump-free. prep

Let the batter rest at room temperature while you preheat the oven. prep

Place a 10-inch cast iron skillet in the oven and preheat to 425°F. Once oven reaches temperature, let skillet heat for 10 more minutes. prep

Using oven mitts, carefully remove the hot skillet and add the butter. Swirl to coat the bottom and sides, then return to oven for 30–60 seconds until butter begins to brown. prep

Remove skillet again, swirl butter evenly, and quickly pour in the prepared batter. assemble

Bake in the preheated oven for 14–15 minutes, until the Dutch Baby is puffed and golden brown. bake

Slice into 4–6 pieces and serve immediately with maple syrup and fresh berries if desired. finish