Preheat oven to 400 degrees Fahrenheit and place an oven-safe 10-inch skillet in the oven until completely heated.
In a medium bowl, add the flour and milk, whisking until combined and smooth. Add in the sugar, eggs, salt, and vanilla, whisking again until completely smooth.
Place the butter inside of heated skillet while it's in the oven until fully melted + sizzling before removing it from oven. Immediately pour the batter into the skillet and place it back in the oven to bake for 16-18 minutes. NOTE: DO NOT open oven door at all until at-least 16 minutes to prevent the pancake from deflating.
Once dutch baby has baked, risen (curvy), and swollen with golden brown edges, remove from the oven and top with fresh berries and dust with powdered sugar.
To serve---slice, drizzle with maple syrup and enjoy!
Bon Appetit!
Notes
NOTE: The ditch baby deflates rather quickly once removed from oven, therefore, it's important to serve immediately.
MAKE AHEAD: You can make the batter a day before and store it in an airtight container and refrigerated. On the day of, simply leave it out at room temperature for 15 minutes or so and start the step by heating the skillet and adding butter before pouring batter to bake.
MILK: You can make this dutch baby dairy-free by using dairy-free milk and butter, however, it doesn't "curve" and swell as greatly. Otherwise, be sure to use whole milk or 2% milk for best results.