Creating your Christmas Stuffed Shells can be a fun and rewarding process. Just follow these simple steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Pasta: In a large pot, boil water and cook the jumbo shells until al dente, according to package instructions. Drain and set aside.
3. Prepare the Filling: In a mixing bowl, combine the ricotta cheese, 1 cup of mozzarella cheese, ½ cup of Parmesan cheese, chopped spinach, garlic powder, onion powder, Italian seasoning, salt, and pepper. Mix until well-combined.
4. Stuff the Shells: Using a spoon, generously fill each cooked pasta shell with the ricotta mixture.
5. Assemble the Dish: Spread half of the marinara sauce evenly on the bottom of a 9×13-inch baking dish. Place the stuffed shells in a single layer, filled side up. Pour the remaining marinara sauce over the shells.
6. Add Cheese Topping: Sprinkle the remaining mozzarella and Parmesan cheese on top of the shells for a gooey finish.
7. Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes. Remove the foil and bake for an additional 10 minutes or until the cheese is melted and bubbly.
8. Cool Slightly: Let the stuffed shells cool for about 5 to 10 minutes before serving.
9. Garnish: If desired, sprinkle with fresh basil for a decorative touch.

Completing these steps will yield amazing Christmas Stuffed Shells that are sure to impress your family and friends.