Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the sweet potato, carrots, and parsnips into uniform 1-inch cubes to ensure even cooking.
Mince the garlic clove finely.
In a large mixing bowl, combine the cubed vegetables and the chicken breast.
Drizzle with avocado oil and sprinkle with dried rosemary, dried thyme, sea salt, black pepper, and minced garlic.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken pieces are not crowded by the vegetables.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are tender and golden-brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Serve the sliced chicken alongside the roasted vegetables for a clean, nutrient-dense meal.