Combine chicken, oil, tomatoes, olives, onion and thyme in a large bowl. Season with salt & pepper and toss. Transfer to a rimmed baking sheet and spread out. Add chicken over the vegetables. Roast for 30 minutes (or until internal temp reaches 165F)
Transfer chicken to a platter and loosely cover with foil. Return vegetables to oven and roast until golden brown- approximately 10 additional minutes. Transfer veggies to the platter with chicken and top with feta cheese.