Season chicken thighs with salt and pepper.
In a large ovenproof pot, heat olive oil and butter over medium heat.
Brown the chicken thighs in batches, skin side down first. Remove and set aside.
Add sausage slices and brown slightly. Remove and set aside with chicken.
Sauté onion and garlic until soft and golden.
Add apples and cook for a few minutes until slightly softened.
Sprinkle flour over and stir for 1–2 minutes.
Deglaze with wine, scraping the bottom of the pot.
Add chicken stock, mustard, bay leaf, thyme, and stir.
Return chicken and sausage to the pot. Bring to a simmer.
Cover and bake at 350°F (175°C) for 45 minutes.
Remove from oven, stir in cream, and simmer uncovered for 10 minutes on stove.
Garnish with parsley and serve with mashed potatoes or crusty bread.