Creating a wonderful dish of conchitas with ground beef is simple. Follow these instructions to ensure a delightful outcome:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Pasta: Boil salted water in a large pot. Cook the conchita pasta according to package instructions until al dente, then drain and set aside.
3. Sauté the Aromatics: In a large skillet, heat the olive oil over medium heat. Add the diced onion and garlic, sautéing until fragrant (about 2-3 minutes).
4. Brown the Beef: Add the ground beef to the skillet, breaking it apart as it cooks. Cook until browned, then drain excess fat if necessary.
5. Combine Filling Ingredients: Stir in the diced tomatoes, Italian seasoning, salt, and black pepper. Let this mixture simmer for 5-7 minutes until well combined.
6. Stuff the Pasta: In a mixing bowl, combine the browned meat mixture with the ricotta cheese and half of the mozzarella. Spoon this filling into each pasta shell and arrange them in a baking dish.
7. Bake: Top the stuffed conchitas with the remaining mozzarella and sprinkle the grated Parmesan over them. Bake for 20-25 minutes, or until the cheese is bubbly and golden.

Each of these steps contributes to the incredible delight that is conchitas with ground beef.