Separate the chicken into thighs and legs and season with salt and pepper and set aside.
Place the butter in a sauté pan. Heat very gently. Add the pieces of chicken and cover with a lid.
Cook gently on both sides without coloring.
Mix in the flour. Cook completely without coloring.
Gradually mix in the stock. Bring to a boil and skim any oil from the top while cooking.
Add the button onions and the button mushrooms and allow to simmer gently until cooked.
Mix the yolks and cream in a separate basin. Gently pour a little bit of the stew liquid into this mixture to temper it. Then gently pour the tempered yolks and cream back into the stew on a low heat until thickened. Serve topped with chopped parsley.
Notes
Serve hot! The sauce will thicken up as it reaches room temperature, which won’t be as pleasant to eat. So make sure you serve immediately alongside rice or bread.