Preheat your oven to 425°F (220°C) and place your [cast-iron skillet] inside to get piping hot. This is the secret to that magical puff, Olivia always calls this the “balloon moment.”
In a blender, combine the [eggs], [milk], [flour], [salt], and [vanilla]. Blend until completely smooth. Olivia loves watching the batter whirl like a milkshake.
Carefully remove the hot skillet from the oven and add the [butter]. Swirl it around as it melts and sizzles, this is what creates those golden, crispy edges.
Immediately pour the blended batter into the hot buttered skillet. Work quickly to keep the pan hot for the best rise.
Bake for 20–25 minutes until puffed, golden, and dramatic. Do not open the oven door, Olivia learned the hard way that the puff disappears if you peek too soon.
Remove from the oven, dust with powdered sugar, add berries or syrup, and slice into wedges. It always deflates a little, and that’s perfectly normal and delicious.