Preparing stuffed shells is a delightful experience that will leave you feeling triumphant. Follow these simple steps to create this incredible dish:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Boil Pasta: In a large pot, bring salted water to a boil. Add the jumbo pasta shells and cook al dente according to package instructions. Drain and set aside to cool.
3. Mix Filling: In a mixing bowl, combine ricotta cheese, ½ cup mozzarella cheese, Parmesan cheese, egg, garlic powder, Italian seasoning, salt, and pepper. Mix until smooth.
4. Prepare Sauce: In a baking dish, spread a layer of marinara sauce to cover the bottom evenly.
5. Stuff Shells: Take each pasta shell and carefully fill it with about 2 tablespoons of the ricotta filling. Place the filled shells in the baking dish on top of the marinara sauce.
6. Add More Sauce: Once all shells are filled, pour remaining marinara sauce over the top, ensuring all shells are covered.
7. Sprinkle Cheese: Add the remaining mozzarella cheese on top of the sauce.
8. Cover and Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
9. Uncover and Brown: After 25 minutes, remove the foil and bake for an additional 5-10 minutes or until the cheese is bubbly and golden.
10. Rest and Garnish: Once out of the oven, let the dish cool for about 10-15 minutes before serving. Garnish with fresh basil or parsley, if desired.

These straightforward steps will guide you in creating an incredible dish that will leave your guests in awe!