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 carrots, then dice the potato into 1-inch cubes and slice the carrots into 1/2-inch thick rounds.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, sweet potatoes, and carrots.
Drizzle with olive oil and add the minced garlic, rosemary, thyme, sea salt, and black pepper, tossing thoroughly to ensure everything is well-coated.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, making sure they are not overcrowded to ensure proper browning.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.