Heat the butter in a saucepan, add the garlic cloves, sauté briefly and add the grated celery, also sauté a little bit, then extinguish with a little bit of chicken soup. Make the garlic as well as the celery a tiny bit, then fill up with the remaining chicken soup.
Blend the eggs and add them to the soup, stirring throughout, as it simmers quietly.
After a few min, pour the soup into the cup, sprinkle the parsley on top and bring to the table with toasted toast cubes.