Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Add the broccoli florets, sliced carrots, and sliced bell peppers to the bowl with the chicken.
In a small jar, whisk together the olive oil, minced garlic, oregano, thyme, sea salt, and black pepper until well combined.
Pour the oil mixture over the chicken and vegetables, tossing thoroughly to ensure every piece is well-coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring no overcrowding for even roasting.
Roast for 18-22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender-crisp.
Remove from the oven and let rest for 3 minutes before serving to allow the juices to redistribute.