Clean the vegetables. Cut the leek, carrots and onions into slices.
Put the butter in a saucepan and fry the vegetables. Then add the stock, milk and thyme and simmer for about 20 minutes. Next add the peas and cream and simmer for another 10-15 minutes.
Finally, season the soup with salt, pepper, chives and parsley and season to taste. Spread on plates and sprinkle with grated cheese.