Heat the electric pressure cooker using the saute function until hot. Add the olive oil to the liner. Then, add the Italian sausage and onion. Season with the garlic powder, salt, and black pepper. Cook the sausage, crumbling as it cooks, until no longer pink. Cancel the saute function and drain the sausage well.

Return the sausage and onions to the electric pressure cooker and add the water. Then pour the pasta into the water, pressing as much below the water line as possible. Top the pasta with the marinara sauce. Do not stir.

Top the electric pressure cooker with the lid and set the valve to sealing. Program the electric pressure cooker with the manual or pressure cook mode for 7 minutes at high pressure. Allow the pressure to naturally release for 5 minutes prior to performing a quick release of the remaining pressure.

Stir the pasta and re-cover the electric pressure cooker for 5 minutes.

Add the cream and parmesan cheese to the pasta and stir to evenly distribute. Top the pasta with mozzarella cheese and cover until it melts.

Serve the pasta with the fresh basil.