Cook pasta in a large pot of boiling salted water for 1–2 minutes less than indicated on the package. Prior to draining pasta, remove about ½ cup of the cooking liquid and set aside.

Drain pasta well then immediately return to pan. Stir in butter, Parmesan cheese and garlic salt. Stir in a small amount of reserved pasta water, loosening pasta to desired consistency. If you forgot to reserve some of the pasta water before draining, just use a little milk.

Add pepper to taste then stir until sauce becomes nice and creamy. Serve immediately and enjoy.