Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure even roasting.
Cut the chicken breast into bite-sized pieces, approximately the same size as the vegetables.
In a large mixing bowl, combine the chicken, sweet potatoes, and carrots.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, rosemary, thyme, and garlic powder.
Toss everything thoroughly until the chicken and vegetables are well-coated in oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the pieces so they roast rather than steam.
Roast for 25-30 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are golden brown and tender.
Remove from the oven and let rest for 2 minutes before serving warm.