Preheat your oven to 375°F (190°C).
Drizzle the chicken breasts with olive oil and sprinkle them with oregano, basil, garlic powder, salt, and pepper. Massage the spices into the chicken.
Grease a baking dish with olive oil. Place the seasoned chicken in the center and surround with sliced zucchinis, halved cherry tomatoes, and sliced black olives.
Transfer the baking dish to the oven and bake uncovered for 30–35 minutes until the chicken reaches an internal temperature of 165°F (74°C).
In the last few minutes of baking, sprinkle crumbled feta cheese over the top. Once done, remove from oven and let it cool slightly before serving hot garnished with fresh parsley.