Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Chop the broccoli into bite-sized florets, slice the red bell pepper into strips, and cut the zucchini into half-moons.
Mince the garlic cloves finely.
In a large mixing bowl, toss the prepared vegetables with half of the olive oil, half of the minced garlic, and a pinch of sea salt and black pepper.
Season the chicken breast on both sides with the remaining olive oil, garlic, dried oregano, dried thyme, sea salt, and black pepper.
Arrange the chicken and vegetables in a single layer on the baking sheet, ensuring they are not overcrowded to allow for even browning.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and drizzle the fresh lemon juice over the chicken and vegetables before serving.