Preheat the Oven
Preheat oven to 190°C (375°F). It's important to allow your oven to reach full temperature before baking to ensure even cooking throughout the casserole.
Mix Ingredients
In a large mixing bowl, combine the shredded chicken, sliced zucchinis, cherry tomatoes, mozzarella cheese, cream cheese, garlic powder, Italian seasoning, salt, and pepper. Mix thoroughly until all ingredients are evenly distributed and the cream cheese coats everything well.
Prepare Baking Dish
Lightly grease a 23x33 cm (9x13 inch) baking dish with the olive oil. Make sure to coat the bottom and sides to prevent sticking.
Transfer Mixture
Spread the chicken and vegetable mixture evenly in the prepared baking dish, ensuring it's distributed in an even layer for consistent cooking.
Add Parmesan Topping
Sprinkle the grated Parmesan cheese evenly across the surface of the casserole. This will create a delicious golden crust as it bakes.
Bake
Bake for 25 to 30 minutes until the zucchini is tender when pierced with a fork and the cheese topping is golden brown and bubbling.
Serve
Allow the casserole to cool for about 5 minutes, then garnish with fresh basil if desired. Portion and serve while still warm.