Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a small mixing bowl, whisk together the olive oil, minced garlic, rosemary, and thyme until well combined.
Place the chicken breast, cubed sweet potato, broccoli florets, and sliced carrots onto the prepared baking sheet.
Drizzle the garlic-herb oil mixture over the chicken and vegetables, then sprinkle evenly with the sea salt and black pepper.
Use your hands or tongs to toss everything together until every piece is thoroughly coated in the herb oil, then spread them out into a single layer.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices remain locked inside.