Roll out the puff pastry into two equal-sized sheets. Bake in a preheated oven at 400°F (200°C) for 12-15 minutes, or until golden brown.
Bring the milk to a boil with the vanilla sugar, then remove from heat.
In a bowl, whisk together the egg yolks, sugar, and pudding powder. Slowly pour in the hot milk, whisking constantly.
Return the mixture to the stovetop and cook over medium heat until thickened. Let cool to room temperature.
Whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the vanilla custard.
Place one baked pastry sheet on the bottom of a baking dish. Spread the vanilla cream evenly over the pastry.
Top with the other pastry sheet, pressing down gently. Refrigerate for at least 2 hours.
Before serving, dust with powdered sugar and slice into equal portions.
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