Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and peel the sweet potato, then dice it into uniform 1/2-inch cubes to ensure even roasting.
Cut the broccoli into bite-sized florets and finely mince the garlic cloves and fresh herbs.
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 until the chicken and vegetables are well-coated in the herb oil.
Spread the ingredients in a single layer on the prepared baking sheet, making sure not to crowd the pan so the vegetables can caramelize.
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 it stays juicy and flavorful.