Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and slice the carrots into 1-inch rounds, and cut the chicken breast into uniform 1-inch cubes.
In a small bowl, whisk together the olive oil, maple syrup, sea salt, and black pepper until well combined.
Place the chicken and carrots in a large mixing bowl, pour the glaze over them, and toss until every piece is thoroughly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces for even roasting.
Roast for 20 minutes, then remove from the oven to toss the pecans onto the tray.
Return to the oven for another 5 minutes until the chicken is cooked through and the pecans are fragrant and toasted.
Garnish with fresh thyme leaves and serve immediately while warm.