Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Chop the red bell pepper into bite-sized pieces and slice the zucchini into half-moons.
Mince the garlic clove finely.
In a mixing bowl, toss the broccoli florets, bell peppers, and zucchini with half of the olive oil, the lemon juice, and the minced garlic.
Pat the chicken breast dry with a paper towel and rub it thoroughly with the remaining olive oil, dried rosemary, dried thyme, sea salt, and black pepper.
Arrange the seasoned chicken breast and the vegetable mixture in a single layer on the prepared baking sheet.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly browned edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy and tender.