Preheat your oven to 425°F and line a large rimmed baking sheet with parchment paper.
Pat the chicken thighs completely dry with paper towels to ensure a golden, crispy exterior.
Peel the sweet potato and cut it into 1-inch cubes, then break the broccoli into bite-sized florets.
In a large mixing bowl, whisk together the olive oil, dried rosemary, garlic powder, sea salt, and black pepper.
Add the chicken, sweet potato cubes, and broccoli florets to the bowl and toss until every piece is thoroughly coated in the herb oil.
Spread the mixture in a single layer on the prepared baking sheet, making sure the chicken pieces are not touching the vegetables to allow for proper roasting.
Bake for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
For an extra-crispy finish, turn the oven to broil for the final 2 minutes of cooking, watching closely to prevent burning.