Follow these simple steps to create your Easy Spinach and Ricotta Stuffed Shells:

1. Preheat Your Oven: Start by preheating your oven to 375°F (190°C).
2. Cook the Pasta: Boil a large pot of salted water and cook the pasta shells according to package directions until al dente. Drain and set aside.
3. Prepare the Filling: In a mixing bowl, combine ricotta cheese, chopped spinach, egg, half of the mozzarella cheese, Parmesan cheese, garlic powder, Italian seasoning, salt, and pepper. Mix until well combined.
4. Stuff the Shells: Using a spoon, fill each cooked shell with the ricotta and spinach mixture. Place the stuffed shells in a 9×13 inch baking dish.
5. Add Sauce: Pour the marinara sauce evenly over the stuffed shells, ensuring they are generously covered.
6. Top with Cheese: Sprinkle the remaining mozzarella cheese over the top of the sauce.
7. Cover and Bake: Cover the baking dish with foil and bake in the preheated oven for 20 minutes.
8. Uncover and Finish Baking: Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbling and golden.
9. Garnish: Remove from the oven and let stand for a few minutes. Garnish with fresh basil if desired.
10. Serve: Enjoy your delicious Easy Spinach and Ricotta Stuffed Shells hot!