Preheat your oven to 350°F (180°C). Line a medium-sized baking pan with parchment paper.
Separate the eggs. In a clean bowl, whisk the egg whites until stiff peaks form. Gradually add the granulated sugar and continue whisking until glossy.
Gently fold in the egg yolks one at a time into the egg white mixture.
Sift together the flour, baking powder, and vanilla sugar. Gently fold the dry ingredients into the egg mixture until just combined.
Pour the batter into the prepared pan and spread evenly. Bake for 15-20 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Let the sponge cake cool completely before slicing into even pieces.
Meanwhile, whip the heavy cream until stiff peaks form. Spread the whipped cream onto the sponge cake slices and top with fresh strawberry slices.
Dust the slices with powdered sugar and serve immediately.
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