Preheat the oven to 350°F (175°C). Gather your ingredients and cooking equipment, including a greased 9x13-inch baking dish.

Cook spaghetti in a large pot of boiling salted water according to package instructions until al dente, about 8–10 minutes. Drain and return it to the pot.

Brown the ground beef in a skillet over medium-high heat for about 5–7 minutes. Drain excess fat and stir in the spaghetti sauce. Simmer for 5 minutes.

In a mixing bowl, combine the hot spaghetti with cream cheese, minced garlic, Italian seasoning, and garlic salt. Stir until the cream cheese melts and combines smoothly.

Spread a thin layer of meat sauce at the bottom of the baking dish. Add half of the creamy spaghetti mixture and spread it evenly.

Layer the remaining spaghetti on top followed by the rest of the meat sauce, ensuring even coverage.

Sprinkle grated Parmesan and mozzarella cheese generously over the surface.

Bake the dish uncovered for about 30 minutes, looking for a bubbly, golden surface. Cover with foil if it over-browns.

Remove from the oven and let rest for 15 minutes before serving.