Fill a large pot with water and add salt. Bring it to a boil. Add pasta and cook until al dente. Stir occasionally to prevent sticking. Once cooked, drain and keep half cup pasta water aside for later use.

Heat olive oil in a large skillet. Add chopped onions and cook until soft. Add minced garlic and stir for aroma. Now add ground beef. Cook until browned and fully cooked. Break it into small pieces while cooking evenly.

Add tomato paste to the cooked beef. Mix well until it coats the meat. Sprinkle salt, pepper, chili flakes, and Italian seasoning. Stir everything together and cook for two to three minutes. This step builds rich and deep flavor.

Lower the heat and pour in milk and heavy cream slowly. Stir continuously to avoid lumps. Let it simmer gently until the sauce becomes smooth and slightly thick. Do not boil too fast, or cream may split.

Add grated parmesan cheese into the sauce. Stir until melted and creamy. Now pour in reserved pasta water slowly. This helps the sauce become silky and cling to pasta. Adjust thickness as needed for perfect creamy texture.

Add cooked pasta into the creamy beef sauce. Toss everything gently until pasta is fully coated. Let it cook for two minutes on low heat. This allows flavors to blend perfectly and makes every bite rich and creamy.

Turn off the heat and sprinkle fresh parsley on top. You can add extra parmesan for more richness. Serve hot immediately for best taste. The pasta should look creamy, glossy, and full of comforting beef flavor.