1. Preheat oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.

2. Cook pasta according to package instructions until al dente. Drain and set aside.

3. In a large skillet, heat olive oil over medium heat. Sauté onion and garlic until fragrant.

4. Add mushrooms and cook until tender, about 5 minutes. Stir in spinach and cook until wilted.

5. Stir in marinara sauce, Italian seasoning, salt, and pepper. Simmer for 5 minutes.

6. In a large bowl, combine cooked pasta, sauce mixture, ricotta, and half the mozzarella. Mix well.

7. Transfer mixture to the baking dish. Top with remaining mozzarella and Parmesan.

8. Bake uncovered for 25–30 minutes, until cheese is golden and bubbling.

9. Remove from oven, let cool slightly, and garnish with fresh basil or parsley before serving.