In lukewarm milk, mix the sugar, then crumble in the yeast. Let it stand for 10 minutes, until foamy.
In a large bowl, sift in the flour, add the salt, then crumble in the cold butter.
Pour in the proofed yeast mixture, sour cream and whole egg. Knead the dough until it becomes elastic.
Mix the breadcrumbs and grated cheese into the dough, then cover and let it rise in a warm place for about 1 hour.
On a floured surface, roll out the dough to about 2 cm thick, then fold it over itself several times to incorporate air.
Roll out again to 2 cm thick, then using a scone cutter, cut out the scones. Place them on a baking sheet lined with parchment paper.
Brush the tops with beaten egg, then sprinkle with a little breadcrumbs. Bake in a preheated oven at 350°F (180°C) until golden brown, about 20-25 minutes.
Let the scones cool on a wire rack, then serve fresh or store in an airtight container.
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