1. Preheat the oven to 200°C (400°F).
2. Place the chicken thighs in a large dish, season with salt, pepper, and herbs. Drizzle with a little olive oil and cook for about 45 minutes, turning them halfway through cooking to ensure they are golden brown.
3. Peel and core the apples, then cut them into large quarters.
4. Sauté the minced onion in a little olive oil. Add the apples, cider (optional), a splash of water, and simmer over medium heat for about ten minutes until the apples are tender.
5. Remove the apples.
6. Add the yogurt, mustard, herbs, salt, and pepper. Simmer for an additional 2 to 3 minutes.
7. Serve the chicken thighs with the apples, sauce, and steamed green vegetables (such as asparagus or green beans).