01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, combine carrots, parsnips, sweet potato, and red onion with 2 tablespoons olive oil, ½ teaspoon salt, ½ teaspoon black pepper, and chopped rosemary. Spread mixture evenly on the prepared baking sheet.
03 - In a small bowl, blend 1 ½ tablespoons olive oil with 1 teaspoon salt, ½ teaspoon black pepper, smoked paprika, garlic powder, and dried thyme. Rub seasoning mixture thoroughly over chicken thighs, ensuring coverage under the skin.
04 - Place seasoned chicken thighs skin-side up nestled among the vegetables on the baking sheet.
05 - Roast in the oven for 35 to 40 minutes until chicken skin is crisp, internal temperature reaches 165°F, and vegetables are tender and caramelized.
06 - For an extra-crispy skin, broil the chicken for 2 to 3 minutes at the end of roasting.
07 - Allow chicken to rest for 5 minutes before serving hot.