Put on a saucepan with water, add the potato cubes, margarine, stock cubes and bay leaves and simmer.
For the dumplings, beat the eggs and salt in a bowl. Gradually add the flour until it becomes a dough-like mass. Be careful not to use too much flour on the outside. The dough must still be sticky.
Heat a spoon and add the batter to the boiling soup, spoon by spoon. The dumplings are good when they come up. Let everything simmer a little. Finally stir the sour cream into the soup and serve immediately.