Chicken Soup a la Parisnenne

This is how I make my chicken soup. It is very very good. I figure you could add mushrooms to it.

Cook chicken in oil until almost brown. Stir in onions and cook until onions are soft Srie in carrot and celery and cook 3 minutes. Pour cold water to cover everything by 2" Bring to a boil and add garlic,parsley stems, thyme and peppercorns preferably tied in a cheesecloth. Turn down heat and simmer 2 1/2 to 3 hours, sometimes I leave it longer. Season with salt a few minutes before it's ready. Strain broth. Bring broth back to heat and cook noodles in it.

I figure that at this point you could cook the mushrooms in 1 Tbs butter, sdd 1Tbs flour to make a roux and add to soup.

Note: I prefer to make the broth the day before, chill it and remove the fat that solidifies on top.