Preheat your oven to 425 °F (about 220 °C).

In a large bowl, crack in the eggs and whisk. Sift the flour into the eggs, then whisk again to combine.

Gradually pour in the milk while whisking, then add the granulated sugar and vanilla, continuing to whisk until smooth and combined.

Grease an 8-inch oven-safe skillet (or similar baking pan). Pour the batter into the skillet.

Bake in the preheated oven for about 15–20 minutes, until the puff rises up and the top turns golden.

Remove from oven — the puff will deflate slightly as it cools.

Dust with powdered sugar, then top with fresh berries. Add yogurt if you like. Serve immediately.