Cut the potatoes into small pieces, the onion into half rings, and the loaf into cubes.
Put the potatoes on to boil. Add a little salt. Cook until done.
Fry the onion in sunflower oil until golden brown.
Fry the diced loaf until golden brown. Sprinkle the finished croutons with spices to taste.
Add fried onions to the cooked potatoes. And beat everything with a blender, adding butter.
Add croutons and spices to taste to the soup and serve.