In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Place the chicken breast in a shallow dish, pour over half of the marinade, and let it marinate for at least 20 minutes in the refrigerator.
Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Toss the broccoli florets, sliced bell peppers, and sliced zucchini with the remaining marinade until every piece is evenly coated.
Arrange the marinated chicken and the vegetables in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.