Cook the Pasta
Bring a large pot of salted water to a boil. Cook the jumbo pasta shells until al dente (about 1–2 minutes less than the package instructions). Drain and rinse with cold water. Set aside, drizzling with olive oil to prevent sticking.
Prepare the Filling
Heat olive oil in a skillet over medium heat. Add ground beef and cook until browned, breaking it into small pieces. Season with salt, pepper, and Italian seasoning. Remove from heat and let cool slightly.
In a mixing bowl, combine ricotta cheese, 1 cup mozzarella, Parmesan, beaten egg, parsley, garlic powder, and the cooked beef. Mix until fully combined.
Assemble the Shells
Preheat your oven to 375°F (190°C).
Spread 1 cup of marinara sauce evenly on the bottom of a 9x13-inch baking dish.
Fill each pasta shell with 2 tablespoons of the ricotta-beef mixture and arrange them in the dish, open side up.
Pour the remaining marinara sauce over the stuffed shells, covering them evenly.
Add Cheese and Bake
Sprinkle the remaining mozzarella cheese over the top. Cover the dish with aluminum foil, ensuring the foil doesn’t touch the cheese.
Bake for 20 minutes, then remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
Serve and Enjoy
Let the dish cool for 5 minutes before serving. Garnish with fresh parsley or basil for a vibrant touch.