In a bowl, mash the cottage cheese with a fork, then stir in the freshly squeezed orange juice and grated orange zest.
Sift the flour into a large bowl, then stir in the baking powder and salt.
Dice the cold butter and cut it into the flour mixture using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Add the granulated sugar, sour cream, and egg, then start to knead the dough.
While kneading, incorporate the orange-cottage cheese mixture until it is evenly distributed throughout the dough.
Cover the dough with a kitchen towel and refrigerate for about 30 minutes to make it easier to handle.
On a lightly floured surface, roll the dough out to about 1.5 cm (½ inch) thickness and 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 to give them a beautiful shine.
Bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until golden brown.
Let them cool, then dust the scones with powdered sugar before serving.
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