Step 1: Cook the Pasta Shells

1. Bring a large pot of salted water to a boil. Add the jumbo pasta shells and cook according to package instructions until al dente, typically 10-12 minutes.
2. Drain and rinse the shells under cold water to stop the cooking process. Set them aside on a baking sheet or plate, ensuring they don’t stick together.

Step 2: Prepare the Mince Mixture

1. Heat olive oil in a large skillet over medium heat. Add the chopped onion and sauté for 2-3 minutes until softened.
2. Stir in the minced garlic and cook for another minute.
3. Add the ground meat to the skillet, breaking it up with a spatula. Cook until browned, about 6-8 minutes. Drain any excess fat if necessary.
4. Season the mince with oregano, basil, smoked paprika, salt, and black pepper. Mix well and cook for an additional 2 minutes. Remove from heat and let it cool slightly.

Step 3: Make the Ricotta Filling

1. In a large mixing bowl, combine ricotta cheese, ½ cup mozzarella cheese, Parmesan cheese, egg, and parsley.
2. Add the cooked mince mixture to the ricotta filling, stirring until everything is evenly incorporated.

Step 4: Prepare the Baking Dish

1. Preheat your oven to 375°F (190°C).
2. Spread 1 cup of marinara sauce evenly across the bottom of a 9×13-inch baking dish. If you prefer a creamier sauce, mix the marinara with heavy cream before spreading it.

Step 5: Stuff the Shells

1. Use a spoon or piping bag to fill each pasta shell with the ricotta and mince mixture. Be generous but avoid overfilling.
2. Place the stuffed shells seam side up in the prepared baking dish, arranging them snugly in a single layer.

Step 6: Add Sauce and Cheese

1. Pour the remaining marinara sauce over the stuffed shells, ensuring they’re evenly covered.
2. Sprinkle the top with the remaining mozzarella cheese and Parmesan cheese.

Step 7: Bake the Dish

1. Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes.
2. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly. For a golden crust, broil for 2-3 minutes at the end.

Step 8: Serve and Enjoy

1. Let the dish cool for 5 minutes before serving.
2. Garnish with fresh basil or parsley, and serve warm. Pair with a side salad or garlic bread for a complete meal.