Preheat oven to 400°F (200°C).
In a large bowl, whisk together olive oil, garlic, lemon juice, lemon zest, oregano, thyme, paprika, salt, and pepper.
Add chicken and toss to coat evenly.
On a large sheet pan, spread sliced onion, zucchini, bell pepper, and cherry tomatoes.
Place marinated chicken on top of vegetables.
Roast for 30–35 minutes, until chicken reaches internal temperature of 165°F and vegetables are tender.
Sprinkle with olives and fresh parsley before serving.
Serve with quinoa, rice, or a simple cucumber-tomato salad.