Follow these easy steps to prepare your Savory Ground Turkey Zucchini Casserole:

1. Preheat Your Oven: Begin by preheating your oven to 375°F (190°C).
2. Cook Turkey: In a large skillet, heat a tablespoon of olive oil over medium heat. Add the ground turkey and cook until browned, about 5-7 minutes.
3. Add Vegetables: Stir in the chopped onion and minced garlic, cooking until softened, about 3-4 minutes.
4. Incorporate Zucchini: Add the diced zucchini to the skillet, and season with salt, pepper, and Italian seasoning. Cook for an additional 5 minutes, allowing the zucchini to soften.
5. Add Marinara Sauce: Pour in the marinara sauce, stirring to combine everything well. Let it simmer for 2-3 minutes.
6. Layer in a Casserole Dish: Transfer the turkey and zucchini mixture into a greased casserole dish, spreading it evenly.
7. Top with Cheese: Sprinkle shredded mozzarella cheese over the top, ensuring it covers the mixture completely.
8. Bake: Place the casserole in your preheated oven and bake for 25-30 minutes, or until the cheese is bubbling and golden brown.
9. Cool and Serve: Allow the casserole to cool for a few minutes before slicing and serving.

Following these steps will yield a delicious Savory Ground Turkey Zucchini Casserole that everyone will love.