1. 1. Preheat your oven to 375°F.

2. 2. Heat 1 tablespoon of olive oil in a large skillet over medium heat. Season the chicken breasts with salt, pepper, and Italian seasoning, then cook them for 5-7 minutes per side until cooked through. Remove the chicken from the skillet, let it rest, and then dice or shred it.

3. 3. In the same skillet, add the remaining 1 tablespoon of olive oil. Sauté the minced garlic for about 1 minute until fragrant, then add the fresh spinach. Cook the spinach until it’s wilted, which should take 2-3 minutes.

4. 4. In a mixing bowl, combine the softened cream cheese with 1/2 cup of shredded mozzarella cheese. Stir in the cooked spinach and garlic, blending everything together until smooth and creamy.

5. 5. In a greased baking dish, layer the diced or shredded chicken. Spread the cream cheese and spinach mixture evenly over the chicken. Top the casserole with the remaining 1/2 cup of mozzarella cheese and the optional Parmesan cheese.

6. 6. Place the assembled casserole in the preheated oven and bake it uncovered for 20-25 minutes, or until the cheese is melted and bubbly.

7. 7. Allow the casserole to cool slightly before serving.