Beat egg whites till stiff. Mix cheese, yolks, and sugar or salt. Stir in enough matzo meal to make a batter thick enough to work with your hands. Fold in butter (if used) and egg whites. Let stand 1/2 hour.
Make small balls and drop into boiling water. When they rise to the top, They are done. Serve with apple sauce, sugar-cinnamon or sour cream.