Combine marinade ingredients in a sealed plastic bag. Add chicken thighs. Refrigerate for at least 1 hour.
Preheat oven to 400°F. Add carrots and sweet potatoes to a large rimmed sheet pan. Drizzle with 2 tablespoons olive oil and onion powder. Cook for 15 minutes.
Remove pan and add Brussels Sprouts, red onion and apples to pan. Cook again for another 15 minutes or until vegetables are tender.
Remove chicken from bag and place on another rimmed pan. Discard marinade.
Cook chicken for about 25 minutes or until thoroughly cooked.