Clean, wash and cut the leek into rings. Peel, wash and chop the potatoes. Peel and chop garlic. Heat 2 tablespoons of oil in a large saucepan. Fry the prepared ingredients in it. Add 1 l water, stir in broth, bring to the boil.
Cover and simmer for about 15 minutes.
Dice bread and fry in 1 tbsp. hot oil. Melt cheese in the soup. Add cream, puree soup. Season to taste. Wash chives, cut into small rolls. Sprinkle soup with croutons and chives.