Preheat your oven to 400°F (200°C). Pat the chicken thighs dry with paper towels and season generously with salt, pepper, and thyme.
Heat olive oil in a large ovenproof skillet over medium-high heat. Once shimmering, place the chicken thighs skin-side down and sear for about 5-7 minutes until the skin is golden brown and crispy.
While the chicken cooks, core and slice the apples into thick wedges. Add the minced garlic to the pan after flipping the chicken, allowing it to cook for about 30 seconds until fragrant.
Arrange the apple slices around the chicken in the skillet, pressing them lightly into the oil. Transfer the skillet to the preheated oven and roast for 25-30 minutes, until the chicken reaches an internal temperature of 165°F and the apples are tender.
Once out of the oven, melt a tablespoon of butter in the skillet if desired, spooning it over the chicken and apples to add extra flavor and a glossy finish.
Let the dish rest for a few minutes, then serve slices of chicken topped with caramelized apples and a drizzle of pan juices for a warm, autumn-inspired meal.