1. Preheat your oven to 375°F (190°C).

2. Bring a large pot of salted water to a boil. Add jumbo pasta shells and cook until al dente. Drain and rinse with cold water to prevent sticking.

3. In a large skillet, cook the ground beef or sausage over medium heat until browned. Drain excess grease. Stir in 2 cups of marinara sauce and simmer for 5–10 minutes.

4. In a mixing bowl, combine ricotta, 1 cup of mozzarella, Parmesan, egg, garlic powder, and Italian seasoning. Mix well.

5. Spread 1 cup of the meat sauce over the bottom of a 9×13-inch baking dish.

6. Fill each cooked shell with the ricotta mixture using a spoon or piping bag. Place the stuffed shells in the baking dish.

7. Spoon remaining meat sauce over the shells. Sprinkle the remaining 1 cup mozzarella on top.

8. Cover the dish with aluminum foil and bake for 25 minutes.

9. Remove foil and bake an additional 10 minutes until cheese is melted and bubbly.

10. Garnish with fresh parsley and serve hot.