Preheat the oven to 350\u00b0F (175\u00b0C).

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

In a large skillet, cook the ground beef and chopped onion over medium heat until the beef is browned and the onion is tender. Add minced garlic and cook for another minute.

Stir in the marinara sauce and let it simmer for 10 minutes.

In a mixing bowl, combine the cream cheese, cottage cheese, and sour cream until smooth.

In a baking dish, layer half of the cooked spaghetti, followed by the cheese mixture, then the remaining spaghetti. Pour the meat sauce over the top.

Sprinkle the mozzarella and parmesan cheese evenly over the top.

Bake in the preheated oven for 30 minutes, or until the cheese is melted and bubbly.