Finely chop the fresh mint, then heat it with a little milk to better release the flavors. Let it cool.
Sift the flour into a large bowl, then mix in the baking powder and salt.
Dice the cold butter and rub it into the flour mixture until it resembles breadcrumbs.
Add the granulated sugar, sour cream, and egg, then start kneading the dough.
Pour in the cooled mint-infused milk and gradually work it into the dough until evenly distributed.
Chop the dark chocolate into small pieces, then knead it into the dough.
Cover the dough and refrigerate for about 30 minutes to make it easier to handle.
On a floured surface, roll out the dough to about 1.5 cm (0.6 inches) thick, then cut out scones using a cookie cutter.
Place the scones on a baking sheet lined with parchment paper and brush the tops with beaten egg for a beautiful sheen.
Bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until golden brown.
Let cool before serving, and garnish with fresh mint leaves if desired.
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