Boil a large pot of salted water and cook the spaghetti according to package instructions until al dente.

In a skillet over medium heat, cook the ground beef or sausage until browned, breaking it up with a spoon.

Stir in the marinara sauce and let it simmer for about 5 minutes.

In a mixing bowl, combine the cream cheese, sour cream, garlic powder, and Italian seasoning.

Drain the cooked spaghetti and add it to the skillet with the meat sauce. Stir well to combine everything evenly.

In the baking dish, layer half of the spaghetti mixture, then spread the cheese mixture on top.

Top with the remaining spaghetti and sprinkle with mozzarella and Parmesan cheese.

Cover the dish with aluminum foil and bake in a preheated oven at 350°F (175°C) for 25 minutes.

Uncover and bake for an additional 15 minutes until golden and bubbly.

Let the dish sit for a few minutes before serving.