METHOD
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make the dough
Add hazelnuts, walnuts, all-purpose flour, and a pinch of salt to a bowl. Stir to combine. Cut the butter into cubes and add to a separate bowl. Add the powdered sugar and vanilla sugar to the butter and mix with an electric mixer fitted with the dough attachment or knead in a stand mixer fitted with a dough hook. Mix until just combined, not whipped. Add the dry ingredients and stir to combine, then knead into a smooth dough with your hands. Place the dough back in the bowl, cover it with clingfilm, and place it in the fridge for one hour.
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preparation
Line a large baking sheet with parchment paper. Place a rack in the middle of the oven and preheat it to 190 °C / 375 °F. Add powdered sugar and vanilla sugar to a small bowl. Stir and set aside. This is your coating.
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shape
Take the dough from the fridge. Scoop a teaspoon (10g) of butter from the dough and shape it into a round ball. Then, shape it into a rope on your lightly dusted working surface. Shape into a crescent cookie. Place each cookie on the prepared baking sheet. Repeat the process until you get about 60 cookies. Leave enough space between them when baking.
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bake
Place the cooking in the oven and bake for 13 – 15 minutes at 190 °C / 375 °F or until they are golden brown. When baked, take them from the oven, set them aside to cool, and then generously dust them with vanilla powdered sugar.