Preheat oven to 425°F with a 10-inch cast-iron skillet inside.
Whisk eggs, milk, sugar, vanilla, and salt until frothy and smooth.
Sprinkle in flour and whisk just until no lumps remain; rest batter 5 minutes.
Add butter to hot skillet; swirl to coat and return to oven until fully melted.
Pour batter into sizzling butter. Bake until puffed and deep golden, 16–18 minutes.
Dust with powdered sugar, squeeze lemon over top, and add berries. Serve right away.
Notes
For a cinnamon-vanilla twist, whisk in 1/2 tsp ground cinnamon. Prefer savory? Skip the sugar and vanilla, add 1/3 cup grated cheese and chopped chives. Leftovers reheat at 300°F for 5–7 minutes to revive crisp edges.This recipe is an original creation inspired by classic Easy Dutch Baby Bake Recipe flavors. All ingredient ratios and instructions are independently developed.