Then you fry/cook the mushrooms. I used oyster mushrooms. You will need nutmeg to add to the taste.
After cooking the mushrooms you make the sauce. For this, you first make a roux, add water and then add the mushrooms and chicken to it. Finally you season it and add the liaison of egg and cream.
If you want a special taste, you can even add wine instead of water.
This is the result: