Clean and wash the soup greens and leek. Finely dice the soup vegetables. Cut leek into fine rings. Wash the chicken filet. Cook meat and soup greens in 1 1/2 litre boiling salted water for 15-20 minutes.
Remove half of the soup vegetables after 10 minutes. Add the white leek rings to the stock and cook for the last 5-10 minutes. Remove the chicken filet from the stock and let it cool down a little. Puree the vegetables in the broth.
Stir in the potato puree powder. Season to taste with salt and pepper. Cut chicken filet into bite-sized pieces. Add to the soup with the remaining vegetables and warm up. Mix sour cream with the pesto.
Wash and finely chop the parsley. Serve the soup with a dollop of cream pesto. Sprinkle with parsley.