Add the butter in a cast iron skillet. Place the skillet into the oven and set the temp to bake at 425 degrees F.
While the oven is heating, mix the flour, milk, and eggs together in a large mixing bowl until smooth and combined.
When the oven is ready, the skillet is hot, and the butter has melted - carefully remove the skillet from the oven. Pour the batter into the hot skillet and return it to the oven.
Bake for 20 minutes until the pancake has puffed up and is golden around the edges.
Carefully remove the skillet from oven and let sit for 1-2 minutes so the pancake can deflate.
Sprinkle the top with powdered sugar and add fresh fruit or lemon slices for serving. Enjoy warm.
Notes
You can use a cast-iron skillet, oven-safe pan, or baking dish to make this Dutch Baby recipe.