Start by heating your oven to 425°F. This ensures the chicken and carrots cook quickly and caramelize beautifully.
Slice your red onions and carrots, and place them alongside the chicken on a sheet pan. Keep everything in similar-sized pieces for even cooking.
In a small bowl, whisk together honey, Dijon mustard, melted butter, and maple syrup. Drizzle over the chicken and vegetables for a sweet, tangy coating.
Sprinkle chili powder, salt, and pepper over everything. Roast in the preheated oven for 20–25 minutes until the chicken is cooked through and veggies are tender.
Turn on the broiler for the last 1–2 minutes. This gives the chicken and carrots a beautiful golden-brown glaze and extra flavor.
Sprinkle chopped fresh scallions over the roasted chicken and carrots. Serve immediately for a warm, comforting meal.