Preheat your oven to 350°F (175°C).

Cook the spaghetti according to package instructions until al dente. Drain and set aside.

In a large skillet, cook the Italian sausage over medium heat until browned, then drain any excess fat.

Stir the marinara sauce into the skillet with the sausage and mix until combined.

In a large bowl, combine the cooked spaghetti with ricotta cheese, garlic powder, Italian seasoning, salt, and pepper.

In a greased 9x13 inch baking dish, layer half of the spaghetti mixture, followed by half of the sausage and marinara mixture, then half of the mozzarella and parmesan cheese.

Top with the remaining spaghetti mixture, followed by the rest of the cheeses on top.

Cover the dish with foil and bake for 25 minutes.

Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.

Let cool slightly, garnish with fresh basil, and serve hot.