Activate the yeast: in lukewarm milk, stir in the sugar and yeast, then let it stand for 10 minutes until foamy.
In a large bowl, combine the flour and salt, then rub in the butter with your fingertips until evenly distributed.
Cook the bacon until crispy, then chop it finely and add it to the flour mixture along with half of the grated cheese.
Add the sour cream, egg, and activated yeast, then knead the dough thoroughly.
On a floured surface, roll out the dough to about 2 cm (¾ inch) thickness, then fold it three times to create a flaky texture.
Cover with a kitchen towel and let it rest for 30 minutes to rise slightly.
Roll it out again to about 2 cm (¾ inch) thickness, then use a scone cutter to cut out the shapes.
Place the scones on a baking sheet lined with parchment paper, and brush the tops with beaten egg.
Sprinkle the tops with the remaining grated cheese, then bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until golden brown.
Let them cool slightly, then serve fresh, with a crispy outside and a tender, crumbly inside.
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