Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1-inch cubes, then chop the broccoli into bite-sized florets.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, sweet potato cubes, and broccoli florets.
Drizzle with olive oil and lemon juice, then sprinkle with the minced garlic, chopped herbs, sea salt, and black pepper.
Toss everything thoroughly to ensure an even coating of oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, placing the chicken in the center.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.
Serve the sliced chicken alongside the roasted vegetables and enjoy immediately.