01 - Preheat oven to 425°F (220°C). Line a large sheet pan with parchment paper or foil for efficient cleanup.
02 - In a large bowl, whisk together olive oil, honey, Dijon mustard, orange zest, orange juice, minced garlic, chopped rosemary, salt, and pepper to create the marinade.
03 - Add the chicken thighs to the bowl containing the marinade and toss thoroughly to ensure an even coating.
04 - Place the marinated chicken thighs, skin-side up, onto the prepared sheet pan.
05 - Toss the Brussels sprouts, red onion wedges, and cranberries in the same bowl with any remaining marinade. Scatter these ingredients around the chicken on the sheet pan.
06 - Roast for 30–35 minutes, or until the chicken skin achieves a golden hue, the internal temperature reaches 165°F (74°C), and the Brussels sprouts are caramelized.
07 - For enhanced chicken skin crispiness, finish the dish under the broiler for 2–3 minutes, monitoring closely to prevent burning.
08 - Serve immediately with pan juices spooned over the chicken and vegetables.