Preheat your oven to 400°F (200°C). In a small bowl, mix together ground cinnamon, dried thyme, salt, and pepper to create a seasoning blend.
Pat the chicken breasts dry with paper towels and rub them all over with half of the spice mixture. Let them sit for a few minutes to absorb the flavors.
Slice the apples, carrots, and parsnips into even pieces to ensure uniform roasting. Set aside.
Spread the sliced vegetables on a baking sheet or large ovenproof skillet. Drizzle with olive oil, and sprinkle with salt, pepper, and the remaining spice mixture. Toss gently to coat everything evenly.
Create space in the center of the vegetables and place the seasoned chicken breasts on top. Scatter the minced garlic over everything.
Roast in the preheated oven for about 35-40 minutes, until the chicken is cooked through and the vegetables are tender and caramelized, with some crispy edges.
Remove from oven and let the dish rest for a few minutes. The chicken should be juicy, and the roasted apples and vegetables should be soft and slightly caramelized.
Slice the chicken and serve it alongside the roasted apples and root vegetables, drizzled with any pan juices if desired. Enjoy the comforting, aromatic flavors.