Prepare all the ingredients. Break the chocolate into smaller pieces, separate the eggs, and place the egg whites in a clean bowl.
Combine the egg yolks with the sugar and vanilla sugar.
Pour the milk into a saucepan and heat over medium heat until lukewarm, then pour it into the egg yolk mixture.
Place the chocolate and butter in a small bowl and melt over a double boiler. Once melted, add it to the egg yolk mixture.
Whisk the egg whites until stiff peaks form, and gently fold them into the chocolate mixture.
Sift the flour and gradually add it to the chocolate mixture. Mix well to combine.
Grease the soufflé mold with butter, then pour in the batter.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, until the soufflé has risen nicely and is golden brown.
Once ready, let it cool slightly, then serve warm and sprinkle a little vanilla sugar on top.
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