This simple yet sensational dish will be on your menu every week!
Melt butter in a large skillet over medium heat. Lightly salt and pepper the chicken, add to the skillet, and cook for 4 to 5 minutes on each side, or until browned, tuning once. Transfer chicken to a platter.
Pour off most of the fat in the skillet, then add the bacon. When it has rendered most of its fat, add the onions, celery, and mushrooms, stir, and cook for 5 minutes, or until soft. Add the garlic, stock, white wine, mustard, and thyme. Return the chicken to the skillet and bring to a simmer. Cover and simmer for 25 minutes. Remove from the heat and let rest for 15 minutes.
Transfer chicken to a platter. Return the skillet to the heat and bring the sauce to a boil. Boil the liquid rapidly, until reduced by half. For a creamy sauce, add heavy cream to the reduction and stir before removing skillet from the heat. Serve the sauce over the chicken.