Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the carrots and parsnips, then slice them into uniform 1-inch rounds or half-moons to ensure even cooking.
Cut the chicken breast into 1-inch cubes, keeping the pieces similar in size to the vegetables.
In a large mixing bowl, combine the chicken, carrots, and parsnips.
Drizzle the olive oil over the mixture and sprinkle with the sea salt, black pepper, garlic powder, dried thyme, and ground turmeric.
Toss everything thoroughly until the chicken and vegetables are well coated in the golden spice oil.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces aren't overcrowded so they roast rather than steam.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the root vegetables are tender with caramelized edges.
Serve immediately while hot and fragrant.