Creating Butternut Squash and Cheese Stuffed Pasta Shells can be a simple and enjoyable process if you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Pasta: Boil the pasta shells according to the package instructions until al dente. Drain and set aside to cool slightly.
3. Prepare the Filling: In a large bowl, combine the mashed butternut squash, ricotta cheese, half of the mozzarella, Parmesan cheese, egg, garlic powder, onion powder, salt, and black pepper. Mix well until smooth.
4. Stuff the Shells: Gently fill each pasta shell with the butternut squash mixture, packing it in but not overstuffing.
5. Layer the Sauce: Spread half of the marinara sauce evenly across the bottom of a baking dish.
6. Arrange the Shells: Place the stuffed shells on top of the marinara sauce in the baking dish.
7. Top with Sauce: Pour the remaining marinara sauce over the tops of the stuffed shells, ensuring they are coated.
8. Add Cheese: Sprinkle the remaining mozzarella cheese over the sauce.
9. Cover and Bake: Cover the dish with aluminum foil and bake in the preheated oven for 20 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
10. Garnish and Serve: Once done, remove from the oven and let cool for a few minutes. Garnish with fresh basil before serving.

By following these steps, you’ll create a dish that’s not only delicious but also sure to impress!