Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the carrots and slice them into 1-inch diagonal pieces for even roasting.
In a medium bowl, toss the carrots with half of the olive oil, half of the sea salt, and half of the black pepper until well coated.
Season the chicken breast evenly on both sides with the garlic powder and the remaining sea salt and black pepper.
Arrange the chicken and carrots in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 20 minutes, then briefly remove the pan from the oven.
Whisk together the maple syrup and the remaining olive oil in a small ramekin.
Drizzle the maple mixture over the carrots and sprinkle the chopped pecans on top.
Return the pan to the oven and roast for an additional 5 to 7 minutes until the chicken reaches an internal temperature of 165°F and the carrots are tender and glazed.