Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and slice the carrot into 1/4-inch rounds and chop the zucchini into half-moons.
In a large mixing bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Add the chicken breast, broccoli florets, sliced carrots, and zucchini to the bowl, tossing thoroughly until everything is evenly coated in the herb oil.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they aren't overcrowded so they roast rather than steam.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.
Remove from the oven and immediately squeeze the fresh lemon juice over the hot chicken and vegetables to brighten the flavors before serving.