Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and dice the sweet potato into 1-inch cubes, and chop the broccoli into bite-sized florets.
In a small bowl, whisk together the olive oil, minced garlic, chopped rosemary, chopped thyme, sea salt, and black pepper.
Place the chicken breast, sweet potato cubes, and broccoli florets onto the prepared sheet pan.
Drizzle the herb oil mixture over the chicken and vegetables, tossing the vegetables and rubbing the chicken to ensure everything is evenly coated.
Spread the ingredients into a single layer, ensuring the chicken has space around it for even roasting.
Roast for 20-25 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 keep it juicy.