Creating Christmas Stuffed Shells is straightforward when following these clear steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Cook Shells: Boil water in a large pot, adding a pinch of salt. Cook the pasta shells according to the package instructions until al dente. Drain and set aside to cool.
3. Prepare Filling: In a large mixing bowl, combine the ricotta cheese, 1/2 cup of shredded mozzarella, Parmesan cheese, egg, garlic powder, onion powder, salt, and black pepper. Mix until well-combined and smooth.
4. Stuff the Shells: Using a spoon, fill each cooked pasta shell with the ricotta mixture. Place the stuffed shells in a 9×13-inch baking dish, arranged side by side.
5. Add Sauce: Pour the marinara sauce over the stuffed shells, ensuring they are adequately covered.
6. Top with Cheese: Sprinkle the remaining 1/2 cup of shredded mozzarella cheese over the top of the marinara sauce.
7. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 25 minutes. Remove the foil and bake for an additional 15-20 minutes until the cheese is bubbly and golden.
8. Garnish: Once baked, remove from the oven and let cool for a few minutes. Garnish with fresh basil for added flavor and color.

These steps will have you crafting a delicious holiday dish that everyone will love.