Creating Thanksgiving Turkey Stuffed Shells is a straightforward process. Follow these steps to create a dish that will impress:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
2. Cook the Pasta: In a large pot of boiling salted water, cook the jumbo pasta shells according to package instructions until al dente. Drain and set aside.
3. Prepare the Filling: In a large mixing bowl, combine the cooked turkey, ricotta cheese, half of the mozzarella cheese, Parmesan cheese, egg, Italian seasoning, salt, and pepper. Mix well until fully combined.
4. Stuff the Shells: Take each cooked pasta shell and fill it with a generous spoonful of the turkey mixture. Repeat until all shells are filled.
5. Layer the Sauce: Spread a thin layer of marinara sauce on the bottom of a greased baking dish. Arrange the stuffed shells in a single layer on top of the sauce.
6. Add More Sauce: Pour the remaining marinara sauce over the stuffed shells, ensuring they are well coated.
7. Top with Cheese: Sprinkle the remaining mozzarella cheese evenly over the top.
8. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 25 minutes. Remove the foil and bake for an additional 10-15 minutes, until the cheese is bubbly and golden brown.
9. Garnish: Once baked, remove from the oven and let cool for a few minutes. Garnish with fresh parsley or basil before serving.

These steps will guide you through the reliable preparation of Thanksgiving Turkey Stuffed Shells, ensuring a delicious outcome every time.