Preheat your oven to 400°F (200°C).
Pat the chicken breast dry and season both sides generously with garlic powder, salt, and pepper. Finely chop the rosemary and thyme, then sprinkle over the chicken.
In a small ovenproof dish, drizzle the olive oil over the chicken to help seal in moisture during roasting.
Arrange the chicken breast on one side of a baking sheet. On the opposite side, spread out the sliced carrots. Lightly toss the carrots with a pinch of salt, pepper, and any remaining herbs.
Roast in the oven for about 20-25 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the carrots are tender and slightly caramelized.
Meanwhile, prepare the brown rice according to package directions if not pre-cooked. Typically, bring water to a boil, add rice, reduce heat, cover, and simmer until water is absorbed.
Plate the roasted chicken with a serving of brown rice and roasted carrots. Garnish with an extra sprinkle of fresh herbs if desired, and serve warm.