Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine olive oil, lemon juice, minced garlic, dried oregano, dried thyme, salt, and pepper to create a marinade.
Add the chicken thighs to the bowl and coat them thoroughly with the marinade. Allow to marinate for about 10 minutes.
On a sheet pan, add the broccoli florets, cherry tomatoes, red onion wedges, and zucchini rounds. Drizzle with olive oil and season with salt and pepper. Toss to coat the vegetables evenly.
Create space in the center of the pan and lay the marinated chicken thighs there.
Place the sheet pan in the preheated oven and roast for about 30-35 minutes, or until the chicken is cooked through and the vegetables are tender.
Remove from the oven and let rest for a few minutes. Garnish with lemon slices if desired before serving.