Follow these straightforward steps to create your Spinach and Ricotta Stuffed Shells with Marinara:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Pasta Shells: Boil the pasta shells in salted water according to the package instructions until al dente. Drain and set aside.
3. Prepare the Filling: In a large mixing bowl, combine the ricotta cheese, chopped spinach, 1/2 cup of mozzarella cheese, Parmesan cheese, egg, garlic, Italian seasoning, salt, and pepper. Mix well until all ingredients are fully combined.
4. Stuff the Shells: Carefully fill each cooked pasta shell with a generous amount of the ricotta mixture using a spoon or piping bag.
5. Prepare the Baking Dish: Spread a thin layer of marinara sauce on the bottom of a 9×13 inch baking dish.
6. Arrange the Shells: Place the stuffed shells in the baking dish on top of the sauce, opening side up.
7. Top with Marinara: Pour the remaining marinara sauce over the stuffed shells, ensuring they are generously covered.
8. Add Cheese: Sprinkle the remaining mozzarella cheese on top of the sauce.
9. Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes. Then remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.
10. Garnish: Once baked, remove from the oven and let it cool slightly. Garnish with fresh basil leaves if desired before serving.

These easy-to-follow steps will help you prepare this delicious dish with ease. Let’s now discuss how to serve these delightful stuffed shells!