Preheat your oven to 425°F (220°C).
In a mixing bowl, whisk together eggs, milk, flour, sugar, and salt until smooth.
Melt the butter in a cast-iron skillet over medium heat.
Once melted, pour the batter into the skillet.
Place the skillet in the preheated oven.
Bake for 15-20 minutes, until the edges are puffed and golden brown.
Remove from the oven and let it cool slightly.
Dust with powdered sugar or add desired toppings.
Slice into wedges for serving.
Enjoy warm, garnished with fruits or syrup!