Creating Stuffed Shells is a rewarding process that involves the following steps:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C). Grease a large baking dish with olive oil to prevent sticking.

2. Cook the Pasta: In a large pot, boil water and cook the jumbo pasta shells for about 9 minutes until al dente. Drain and set aside to cool.

3. Prepare the Filling: In a mixing bowl, combine ricotta cheese, 1 cup of mozzarella cheese, egg, Parmesan cheese, parsley, garlic powder, onion powder, salt, pepper, and Italian seasoning. Mix until well blended.

4. Stuff the Shells: Take each cooked shell and spoon a generous amount of the cheese filling into it. Place the filled shells open side up in the greased baking dish.

5. Add Marinara Sauce: Pour marinara sauce evenly over the stuffed shells, ensuring they are well covered.

6. Top with Cheese: Sprinkle the remaining mozzarella cheese over the top of the sauce. This will create a delicious melted layer.

7. Bake: Cover the baking dish with aluminum foil and place it in the preheated oven. Bake for 30 minutes.

8. Uncover and Finish Baking: Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and lightly browned.

9. Let Cool: Once done, allow the Stuffed Shells to sit for a few minutes before serving.

10. Garnish: For an added touch, garnish with extra parsley before serving.

This simple yet detailed guide will help you effortlessly create a stunning dish that everyone will love.