Sift the flour into a large bowl. Add the baking powder, salt, and vanilla sugar, then mix well.
Cut the cold butter into small cubes and add it to the flour. Using your fingertips, quickly rub the butter into the flour until the mixture resembles breadcrumbs.
Finely grate the carrot and add it to the flour mixture along with the ground hazelnuts. Mix thoroughly.
In a separate bowl, whisk together the egg, powdered sugar, and sour cream. Add this mixture to the flour-hazelnut-carrot base and quickly knead until just combined.
Wrap the dough in plastic wrap and chill in the refrigerator for at least 30 minutes to allow the flavors to meld.
On a lightly floured surface, roll out the chilled dough to a thickness of about 1.5 cm (approximately 0.6 inches). Use a scone cutter to cut out the scones.
Place the scones on a baking sheet lined with parchment paper and bake in a preheated oven at 350°F (180°C) for 12-15 minutes, or until golden brown.
Let the scones cool slightly before serving. Dust with powdered sugar before serving. Delicious served fresh or warm!
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