Boil the potatoes, then peel them and press them through a potato press. Let the potato mixture cool down.
Separate the eggs. Knead the egg yolk with the cornstarch, butter or margarine, salt, pepper and nutmeg to taste into the potato mixture.
Shape the dough into small croquettes. First form a small dumpling, then roll it and press the ends lightly. Roll these in the egg white and then in breadcrumbs.
Bake the breaded croquettes in hot fat or in the deep fryer until they have reached the desired color.