Creating Easy Spinach and Ricotta Stuffed Shells is simple with these clear steps:

1. Preheat Oven: Start by preheating your oven to 375°F (190°C).

2. Cook Pasta: Boil the pasta shells according to package instructions. Drain and set aside to cool.

3. Prepare Filling: In a large bowl, mix together the ricotta cheese, ½ cup of mozzarella cheese, chopped spinach, egg, garlic powder, oregano, salt, and pepper until well combined.

4. Fill Shells: Carefully stuff each cooked shell with the ricotta and spinach mixture, using a spoon to pack it in tightly.

5. Arrange in Dish: Spread 1 cup of marinara sauce evenly on the bottom of a 9×13 inch baking dish. Place the stuffed shells on top, open side up.

6. Top with Sauce: Pour the remaining marinara sauce over the stuffed shells, ensuring they are well coated.

7. Add Cheese: Sprinkle the remaining ½ cup of mozzarella cheese on top of the marinara sauce.

8. Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes. Then remove foil and bake an additional 10 minutes, or until cheese is bubbly and slightly golden.

9. Cool and Serve: Once baked, let the dish cool for about 5 minutes before serving. Garnish with fresh basil if desired.

Following these steps ensures delicious stuffed shells every time, making dinner an effortless affair.