Remove the skin from the chicken pieces, and season with salt and pepper.
Pour the oil into a flameproof casserole dish.
Render the bacon, then add the onions.
Add the garlic, the mushrooms, and finally the chicken. Pour in the wine, and add the herbs.
Bake, covered, for about 45 minutes.
A few minutes before the end of cooking, stir the flour mixed with butter into the pan juices, and turn the chicken pieces to coat them well with the sauce.