Put all the dough ingredients in a stand mixer bowl and knead with the paddle attachment. Don't overwork it: as soon as the dough comes together into a ball, stop, transfer to a bag and refrigerate for 30 minutes.
For the filling, quickly mash all the ingredients with a fork until combined and smooth.
Dust the counter with flour, place a piece of dough, dust lightly on top and roll out into a sheet 5-7 mm thick. Cut out circles 10 cm across with a cutter.
Place filling on one half of each circle and fold the other edge over it, not all the way. Place the sochniki on parchment.
Brush with beaten egg yolk and sprinkle with almond flakes.
Bake for 25 minutes in an oven preheated to 180 C. Enjoy!