Preheat your oven to 425°F (220°C).
In a small bowl, whisk together the maple syrup, a pinch of salt, black pepper, and one teaspoon of olive oil. Set aside the glaze.
Pat the chicken thighs dry with paper towels. Brush both sides lightly with any remaining olive oil, and season with salt, pepper, and finely chopped thyme leaves.
Place the chicken thighs in the center of a baking tray.
Prepare the vegetables by peeling and slicing the carrot into sticks, and halving the Brussels sprouts.
Toss the carrots and Brussels sprouts in a bowl with a small drizzle of olive oil, salt, and pepper.
Arrange the vegetables around the chicken on the baking tray.
Drizzle the maple syrup glaze over the chicken thighs.
Roast in the preheated oven for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the vegetables are tender and slightly caramelized.
If desired, broil for an additional 2-3 minutes to crisp up the edges of the Brussels sprouts.
Remove from the oven and let rest for a few minutes before serving.