Preheat the oven to 400 degrees Fahrenheit (200 degrees Celsius). While oven preheats, prepare ingredients.
In a large bowl, toss chicken chunks and zucchini rounds with olive oil, minced garlic, lemon juice, oregano, basil, salt, and pepper until well coated.
Spread the mixture evenly in a 9 by 13 inch baking dish in a single layer, avoiding overlapping.
Sprinkle mozzarella and Parmesan cheese evenly over the top.
Bake uncovered for 25 to 30 minutes, until chicken reaches 165 degrees Fahrenheit internal temperature and cheese is golden and bubbly. Tent with foil if cheese browns too quickly.
Remove from oven, let rest 3 to 4 minutes, and garnish with fresh parsley before serving.
Notes
Use chicken thighs for extra tenderness and juiciness. They work beautifully in this recipe with the same cooking time.
Add Kalamata olives or cherry tomatoes for extra Mediterranean flavor and variety.
Substitute feta cheese for mozzarella for a tangier, more authentic Greek flavor profile.
Pat zucchini dry with paper towels before tossing to prevent excess moisture in the baking dish.
Make-ahead tip: Assemble up to 24 hours ahead without cheese, cover and refrigerate. Add cheese right before baking.
Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in oven at 350 degrees Fahrenheit for best results.