Preheat oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized pieces and slice the carrots into half-inch thick rounds.
In a small bowl, whisk together the olive oil, maple syrup, sea salt, black pepper, and ground cinnamon until emulsified.
Place the chicken and carrots on the baking sheet and pour the maple mixture over them, tossing with your hands to coat every piece.
Spread the ingredients out in a single layer, ensuring they are not crowded so they roast rather than steam.
Bake for 20 minutes, then remove the tray and scatter the pecans over the top.
Return to the oven for another 5 minutes until the chicken is golden, the carrots are tender, and the pecans are fragrant.
Serve immediately, drizzling any extra glaze from the pan over the top for a sweet and savory finish.