Toast the hazelnuts in a dry skillet over medium heat for 4-5 minutes, until fragrant and lightly browned. This enhances their flavor. Let them cool, then coarsely chop them in a food processor – they shouldn't be completely ground; leave some crunchy pieces.
In a bowl, combine the mascarpone cheese, powdered sugar, and vanilla sugar. Add the chopped hazelnuts and mix well to create a homogeneous, yet textured filling. TIP: For a more intense flavor, add 1 drop of vanilla extract.
On a lightly floured surface, gently roll out the puff pastry and cut it into 10x10 cm (approximately 4x4 inch) squares. Work quickly to prevent the pastry from warming up too much, as it will become more difficult to handle.
Place a teaspoon of filling in the center of each square. Fold it in half to form a triangle, then press the edges together with a fork to seal them well. Be careful not to overfill the pastry, as the filling might leak out!
Whisk the egg and brush it over the top of the samosas. This will give them a beautiful shine and golden-brown color after baking. TIP: Diluting the egg with a little water makes it easier to brush.
Preheat the oven to 350°F (180°C). Place the samosas on a baking sheet lined with parchment paper and bake them for 20-22 minutes, until golden brown. Keep a close eye on them towards the end of the baking time, as they can burn quickly!
After baking, let them rest on the baking sheet for 10 minutes to allow the filling to set slightly and cool down a bit. They are delicious both warm and cold!
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