Prepare the dough in a bread machine, for this put the ingredients for the dough in the following sequence - milk, flour, vanilla sugar, cane sugar, salt, butter, yeast. Leave in a warm place for 25 minutes. Add vanillin, cane sugar, egg to cottage cheese. Mix.
Divide the dough into small pieces. Roll out each part into a layer 1 cm thick. Put 2 tsp on circles of dough. freshly frozen blueberries.
Put 2-3 tsp on top. curd filling.
Gather the dough into a ball, carefully connect all the edges.
Lay the stuffed buns on a greased baking sheet. Let stand 25 minutes in a warm place.
Brush the buns with beaten egg yolk. Sprinkle with poppy seeds.
Bake in an oven preheated to 220 degrees for 30 minutes.