Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the carrots and slice them into 1/2-inch thick diagonal rounds.
Cut the chicken breast into 1-inch bite-sized cubes for even cooking.
In a large bowl, whisk together the olive oil, maple syrup, garlic powder, sea salt, and black pepper.
Add the chicken and carrots to the bowl, tossing thoroughly until every piece is coated in the glaze.
Spread the mixture in a single layer on the prepared baking sheet, ensuring no pieces are overlapping.
Roast for 18-22 minutes, or until the chicken is cooked through and the carrots are tender with caramelized edges.
During the last 5 minutes of roasting, sprinkle the chopped pecans over the tray to toast them.
Garnish with fresh thyme leaves before serving warm.