Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and cut it into 1-inch cubes, and break the broccoli into bite-sized florets.
Mince the garlic cloves and finely chop the fresh rosemary leaves.
Place the chicken breast, sweet potato cubes, and broccoli florets on the prepared baking sheet.
Drizzle the extra virgin olive oil over the chicken and vegetables.
Sprinkle the minced garlic, chopped rosemary, sea salt, and black pepper evenly over everything.
Toss the vegetables and rub the chicken to ensure all pieces are well-coated in the oil and seasonings.
Arrange the chicken in the center with the vegetables spread out in a single layer around it.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices redistribute.