For the dough, dissolve the yeast in warm milk, add 2 tbsp. l. sugar, mix and leave in a warm place for 15 minutes. When the dough rises, add the remaining sifted flour, salt, vegetable oil. Knead the dough. Leave the dough in a warm place for 20 minutes.
Roll out the dough and lay out in a mold, decorate the sides.
Mix sour cream with beaten eggs, add 3 tbsp. l. sugar, stir. Put the sour cream and egg mass on the dough, put freshly frozen blueberries on top, sprinkle with the remaining sugar.
Bake in an oven preheated to 200 degrees for 35-40 minutes.