This recipe comes from the mother of a student of mine, which in turn got in from her mother, and so on.
While a sweet dish, it's served for dinner.
700-800 grams of cottage cheese (probably around three-four cups) (NOTE: The best cheese for this is twaróg (called quark in English, I believe.) It's like a drier form of cottage cheese.)
3 tablespoons of flour (more if needed)
Pinch of salt
Bread crumbs (optional)
In two separate bowls, separate the egg whites and the yolks. Beat the whites until stiff like a meringue. Combine first four ingredients (including both egg whites and yolks) into large mixing bowl and mix thoroughly until a sticky dough has formed. Start boiling some water.
Divide the dough into two equal balls; roll balls between palms and a floured surface to form a mid-sized 'ropes' of dough about two-inches thick. Cut the ropes into pieces, maybe a half-inch thick. Place the pieces into the boiling water and cook them for three (3) minutes. Retrieve the dumplings using a slotted spoon and place on a dish.
Smother with butter; sprinkle with bread crumbs; sprinkle with sugar; serve.
The bread crumbs, sugar, and butter are optional. You may wish to serve them in a white-cheese sauce, or as traditional pierogi (or however you wish.)
There are several variations of this recipe. Some call for potatoes (use 75% of the cheese and add in 200g of cooked, mashed potatoes.) Experiment a little and see what works!