Activate the yeast: In lukewarm milk, stir in the sugar and yeast. Let it sit for 10 minutes, or until frothy.
In a large bowl, whisk together the flour and salt. Cut in the butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Add the sour cream, egg, and activated yeast mixture. Mix until a dough forms. Knead the dough until smooth.
On a lightly floured surface, roll out the dough to about ¾ inch (2 cm) thickness. Fold the dough in thirds to create layers.
Cover with a kitchen towel and let it rest for 30 minutes to rise slightly.
Roll out the dough again to about ¾ inch (2 cm) thickness. Use a round cookie cutter to cut out the scones.
Place the scones on a baking sheet lined with parchment paper and brush the tops with beaten egg.
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 fresh, soft, and flaky scones.
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