Creating Baked Mostaccioli is straightforward when you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook Pasta: In a large pot, bring salted water to a boil. Add the mostaccioli and cook according to package instructions until al dente. Drain and set aside.
3. Mix Cheese Ingredients: In a mixing bowl, combine ricotta cheese, 1 cup of mozzarella cheese, grated Parmesan cheese, egg, garlic powder, Italian seasoning, salt, and black pepper. Stir until well blended.
4. Combine Pasta and Sauce: In a large bowl, mix the cooked mostaccioli with marinara sauce until evenly coated.
5. Layer the Dish: In a 9×13-inch baking dish, spread half of the pasta mixture on the bottom. Spoon half of the cheese mixture over the pasta. Repeat the layers with the remaining pasta and cheese mixture.
6. Top with Mozzarella: Sprinkle the remaining cup of mozzarella cheese over the top layer.
7. Cover and Bake: Cover the baking dish with aluminum foil and place it in the preheated oven. Bake for 20 minutes.
8. Uncover and Brown: Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden brown.
9. Cool Slightly: Remove from the oven and allow it to cool for about 5-10 minutes before serving.
10. Garnish and Serve: Optionally, garnish with fresh basil leaves for added flavor and presentation.

By following these steps, you’ll create a delicious Baked Mostaccioli that will impress everyone at your table.