Activate the yeast: In the lukewarm milk, stir in the sugar and yeast. Let it stand for 10 minutes, until frothy.
In a large bowl, combine the flour and salt. Rub in the butter with your fingertips until the mixture resembles coarse crumbs.
Add the sour cream, egg, and activated yeast. Mix well until a dough forms.
On a lightly floured surface, roll out the dough to about 1 cm (½ inch) thick. Sprinkle with half of the grated cheese, then fold the dough in thirds, like a letter.
Cover with a clean kitchen towel and let it rest for 30 minutes to rise slightly.
Roll out the dough again to about 2 cm (¾ inch) thick. Use a cookie cutter or scone cutter to cut out the shapes.
Place the scones on a baking sheet lined with parchment paper and brush the tops with beaten egg.
Sprinkle the remaining grated cheese on top and bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let them cool slightly before serving. Enjoy them fresh, with their soft and flaky texture.
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