Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast dry with a paper towel and season both sides with half of the sea salt, black pepper, rosemary, and thyme.
In a large mixing bowl, combine the broccoli florets, sliced carrots, and chopped red onion.
Drizzle the vegetables with olive oil and add the minced garlic along with the remaining herbs, salt, and pepper, tossing well to coat evenly.
Spread the vegetables in a single layer on the baking sheet and place the seasoned chicken breast in the center.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy.