Wash and peel the apples, then grate them using a coarse grater. Squeeze out the excess juice to prevent the dough from becoming soggy.
Sift the flour into a large bowl. Add the baking powder, salt, and cinnamon. Whisk together to ensure the dry ingredients are evenly distributed.
Cut the cold butter into cubes and rub it into the flour mixture until it resembles coarse crumbs.
Add the granulated sugar, sour cream, and egg. Start to bring the dough together. If necessary, add a little more sour cream to achieve a workable consistency.
Knead in the squeezed apples, forming a homogeneous dough. If the dough is too sticky, add a little flour.
Cover the dough with a kitchen towel and chill in the refrigerator for about 30 minutes to make it easier to handle.
On a lightly floured surface, roll out the dough to about 1.5 cm (½ inch) thickness. Cut out scones using a scone cutter or a glass.
Place the scones on a baking sheet lined with parchment paper. Brush the tops with beaten egg to ensure a golden-brown finish.
Bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until golden brown.
Once baked, let them cool for a few minutes, then dust with powdered sugar and serve!
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