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 over medium heat, cook the ground beef or sausage until browned. Drain excess fat.

Stir in the marinara sauce, garlic powder, onion powder, Italian seasoning, salt, and pepper. Simmer for 5 minutes.

In a large bowl, combine the softened cream cheese, sour cream, and half of the mozzarella cheese. Mix until smooth.

Add the cooked spaghetti to the cream cheese mixture and stir until well combined.

In a greased 9x13-inch baking dish, layer half of the spaghetti mixture, followed by half of the meat sauce. Repeat the layers.

Top with the remaining mozzarella cheese and grated Parmesan cheese.

Cover with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and golden.

Let it cool for 5 minutes before serving. Garnish with chopped parsley.