Creating your Family-Friendly Chicken Zucchini Bake is straightforward if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Chicken: If not using pre-cooked chicken, grill or sauté chicken until fully cooked, then dice it.
3. Prepare the Zucchini: Slice the zucchini into thin rounds. Set aside.
4. Mix Ingredients: In a large bowl, combine the diced chicken, marinara sauce, Italian seasoning, garlic powder, salt, and pepper. Mix well.
5. Layer the Dish: In a greased baking dish, start by layering half of the zucchini slices at the bottom.
6. Add Chicken Mixture: Spread half of the chicken mixture over the zucchini layer.
7. Add Cheese Layer: Sprinkle half of the mozzarella and Parmesan cheeses over the chicken.
8. Repeat Layers: Repeat the zucchini, chicken, and cheese layers with the remaining ingredients.
9. Top with Olive Oil: Drizzle olive oil over the top layer to add flavor and help with browning.
10. Bake: Cover the dish with foil and bake for 25 minutes. Then, remove the foil and bake for an additional 10-15 minutes, until the cheese is bubbly and golden.
11. Rest and Garnish: Let it rest for 5 minutes before garnishing with fresh basil.

These clear steps will guide you in preparing this incredible family meal seamlessly.