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 cut it into even 1-inch cubes to ensure uniform cooking.
Mince the garlic clove finely and place it in a large mixing bowl.
Add the chicken cubes, broccoli florets, and sliced carrots to the bowl with the garlic.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, dried rosemary, and dried thyme.
Toss everything thoroughly until the chicken and vegetables are well-coated in oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces are not overcrowded.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with browned edges.
Remove from the oven and immediately squeeze the juice of half a lemon over the tray to brighten the flavors before serving.