Preheat oven to 425º Fahrenheit.
Whisk eggs for 30-40 seconds, add milk, flour, vanilla extract, and salt and continue to whisk until batter is smooth.
Add 3 tablespoons butter to a 10-inch cast-iron, oven proof skillet or pie dish and transfer to oven for 3-5 minutes. Carefully remove from oven and pour batter into the center of the hot skillet.
Bake in the preheated oven until puffed and golden, 20 to 25 minutes. Brush with 1 tablespoon butter, and dust with confectioners’ sugar. Serve with optional toppings, if desired. Enjoy!
Optional Toppings:
Caramelized Apples
Chocolate Chips
Fresh Fruit
Fresh Lime Juice
Maple Syrup
Whipped Cream
