In a large bowl, mix the cooked pasta, ricotta, spinach, half of the mozzarella, Italian seasoning, and marinara sauce.
Add salt and pepper to taste, then stir until everything is well combined.
Transfer the mixture to a baking dish and top with remaining mozzarella and Parmesan cheese.
Bake for 20 minutes or until the cheese is bubbly and golden.
Serve
Serve it hot, straight from the dish. It’s perfect for a cozy weeknight dinner, and the leftovers are just as good the next day!