Prepare all the ingredients. Separate the eggs, placing the egg whites in a clean bowl.
In a separate bowl, whisk together the egg yolks, sugar, vanilla sugar, and white wine.
Heat the milk in a saucepan over medium heat until lukewarm. Gradually whisk the warm milk into the egg yolk mixture.
Melt the butter and stir it into the egg yolk mixture until well combined.
Beat the egg whites until stiff peaks form. Gently fold in the heavy cream.
Sift the flour and gradually add it to the mixture, whisking until smooth and well combined.
Grease a soufflé dish with butter, then pour in the batter.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the soufflé has risen nicely and is golden brown.
Once cooked, let it cool slightly before serving warm.
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