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 slice them into 1-inch diagonal chunks, then dice the chicken breast into uniform 1-inch cubes.
In a small bowl, whisk together the olive oil, maple syrup, garlic powder, sea salt, and black pepper until well combined.
Place the carrots and chicken on the prepared baking sheet and pour the maple mixture over them, tossing thoroughly to ensure every piece is coated.
Spread the mixture into a single layer, ensuring there is space between pieces to allow for proper roasting rather than steaming.
Roast in the oven for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the carrots are tender with golden, caramelized edges.
Remove from the oven, sprinkle with fresh thyme leaves, and serve immediately while warm.