Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into half-inch cubes, and chop the broccoli into bite-sized florets.
Mince the garlic cloves finely and set aside.
In a large mixing bowl, combine the chicken breast, sweet potato cubes, and broccoli florets.
Drizzle the olive oil over the mixture and add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not overcrowded to allow for proper browning.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy.