Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel to remove excess moisture, which helps achieve a crispier exterior.
Cut the sweet potato into even wedges and halve the Brussels sprouts so they roast at the same rate.
In a large mixing bowl, combine the chicken, sweet potatoes, and Brussels sprouts with the olive oil, rosemary, thyme, garlic powder, salt, and pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the herb-oil mixture.
Arrange the ingredients in a single layer on the prepared baking sheet, ensuring the chicken breast is in the center with space around it.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and flavorful.