In a large bowl, mix the olive oil, minced garlic, oregano, thyme, lemon juice, salt, and pepper. Add the chicken thighs to the marinade, ensuring they are well coated. Let them marinate for about 15 minutes for maximum flavor.
While the chicken is marinating, prepare the vegetables. In a separate bowl, combine the diced red bell pepper, sliced zucchini, halved cherry tomatoes, and kalamata olives. Drizzle with olive oil and season with salt and pepper, tossing everything to combine nicely.
Spread the marinated chicken thighs in the center of a large baking sheet. Arrange the prepared vegetable mixture around the chicken.
Bake in the preheated oven for 25-30 minutes or until the chicken is cooked through (internal temperature reaches 165°F/75°C) and the vegetables are tender.
Remove the baking sheet from the oven and let it rest for 5 minutes.
Just before serving, sprinkle crumbled feta cheese and fresh parsley over the chicken and vegetables for added flavor and a fresh touch.