01 - Set oven temperature to 375°F (190°C) and allow to preheat fully.
02 - In a large bowl, combine zucchini, cherry tomatoes, and red onion. Drizzle with olive oil and toss with dried oregano, garlic powder, salt, and pepper until all vegetables are evenly coated.
03 - Add the cooked chicken breast to the vegetable mixture and mix until well combined.
04 - Lightly grease a baking dish. Transfer the prepared mixture into the dish and spread into an even layer.
05 - Sprinkle crumbled feta cheese evenly over the top of the layered ingredients.
06 - Place the dish in the preheated oven and bake for 25 to 30 minutes, or until the vegetables are tender and the top is lightly golden.
07 - Remove the dish from the oven and allow it to cool for 5 minutes.
08 - Garnish with chopped parsley and serve warm.