Activate the yeast: combine the lukewarm milk, sugar, and yeast in a bowl. Let it stand for 10 minutes, or until foamy.
In a large bowl, combine the whole wheat 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 well.
On a lightly floured surface, roll out the dough to about 2 cm (¾ inch) thickness. Fold the dough in thirds, like a letter, to create layers.
Cover with a clean kitchen towel and let rest for 30 minutes to rise slightly.
Roll out the dough again to about 2 cm (¾ inch) thickness. Use a cookie cutter or biscuit cutter to cut out scones.
Place the scones on a baking sheet lined with parchment paper and brush the tops with a beaten egg.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let cool slightly before serving. Enjoy fresh, with a crispy exterior and soft, crumbly interior.
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