First of all clean the mushrooms well (here the guide to do it better) and cut them into slices.
Peel the onion, carrot and celery and chop them, then sauté them in a large saucepan with oil.
Also add the mushrooms and let them flavor briefly, then cover with the broth, add the sifted flour and cook for 20-25 minutes over medium-low heat.
The mushroom soup is ready: season with salt and pepper, add a little parsley and serve.
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