Prepare the vegetables. Pour one liter of water into a saucepan, add chopped potatoes, carrots, celery, bay leaf, and set to boil.
Prepare the sauté. Fry finely chopped onion in a preheated frying pan. Add mushrooms to the onion and fry for 10 minutes. Add chopped garlic to the mushrooms and onion and fry for another 1 minute. Put the fried vegetables in a saucepan with vegetables, add salt, pepper and cook for 15 minutes. Remove the bay leaf from the soup and blend the contents of the saucepan until smooth. Add cream and stir.