Preheat your oven to 350°F (180°C) and line a baking pan with parchment paper.
Separate the eggs. In a bowl, beat the egg yolks with the granulated sugar and vanilla sugar until pale and fluffy.
In a separate bowl, whisk the egg whites with a pinch of salt until stiff peaks form.
Gently fold the egg whites into the yolk mixture, being careful not to deflate the whites.
Sift the flour into the batter and gently fold until just combined. Be careful not to overmix.
Pour the batter into the prepared baking pan and spread evenly.
Bake for about 20 minutes, or until the sponge cake is golden brown and a toothpick inserted into the center comes out clean.
Let the sponge cake cool in the pan for 5 minutes, then transfer it to a wire rack to cool completely.
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