Follow these simple instructions to create your amazing easy stuffed shells:

1. Preheat Oven: Begin by preheating your oven to 375°F (190°C).
2. Cook Pasta: In a large pot of salted boiling water, cook the jumbo pasta shells according to package instructions until al dente. Drain and set aside.
3. Prepare Filling: In a mixing bowl, combine ricotta cheese, half of the mozzarella, Parmesan cheese, egg, salt, and pepper. Mix until well combined.
4. Stuff Shells: Take each cooked shell and fill it generously with the cheese mixture.
5. Spread Sauce: Pour a little marinara sauce at the bottom of a 9×13-inch baking dish. Arrange the stuffed shells on top, seam side up.
6. Top with Sauce: Pour the remaining marinara sauce over the stuffed shells. Sprinkle the rest of the mozzarella cheese on top.
7. Bake: Cover the dish with aluminum foil and bake for 25-30 minutes. Remove the foil and bake an additional 5-10 minutes until the cheese is bubbly and golden.
8. Cool: Let it cool for about 10-15 minutes before serving to allow the flavors to set.
9. Garnish: Optionally, sprinkle fresh basil or parsley on top for a burst of color and flavor.

Following these steps will ensure your easy stuffed shells turn out incredible every time!