Prep Dough: Prepare the pierogi dough and let it rest at room temperature, wrapped in cling film, for 20-30 minutes.
Make Filling: Mix farmer's cheese, sugar, and vanilla extract. Taste and add more sugar or some lemon juice if needed. Incorporate the egg yolks, then refrigerate if not using immediately.
Cut Dough: Divide the rested dough into 2-3 portions, roll out the first on a floured surface to a thin but sturdy thickness.
Form Circles: Use a round cutter or glass to cut dough circles, repurposing any remnants for extra pierogi.
Make Pierogi: Place filling on a dough circle, fold and seal from the center, expelling trapped air. Moist edges with a wet finger if needed.
Cover: Move pierogi to a flour-dusted surface, covered by a damp towel. Dust flour on touching areas to prevent sticking.
Boil: Cook pierogi in boiling, salted water until they float, then simmer for 2-3 additional minutes.
Scoop: Use a slotted spoon to extract the cooked pierogi from the pot.
Serve: Serve the finished pierogi hot.