Preheat your oven to 350°F (175°C).

In a large pot of salted boiling water, cook the spaghetti according to the package directions until al dente. Drain the spaghetti and set aside.

In a large skillet over medium heat, brown the ground beef. Season with salt and pepper, breaking it into small pieces until completely cooked. Drain any excess fat.

In a large mixing bowl, combine the cooked spaghetti, ground beef, and spaghetti sauce. Mix thoroughly until everything is well coated.

In a separate bowl, mix the cottage cheese, sour cream, and half of the mozzarella cheese. Stir to combine.

In a greased 9×13-inch baking dish, spread half of the spaghetti mixture evenly, followed by the cheese mixture. Top with remaining spaghetti mixture.

Sprinkle the remaining mozzarella cheese and Parmesan cheese on top.

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

Let it rest for 5-10 minutes, then garnish with chopped parsley before serving.