Fill a large pot with water and bring it to a rolling boil, then add a generous pinch of salt—this is your only opportunity to season the pasta itself. While the water heats, finely grate both the romano and parmesan cheeses and set them aside together; I always grate fresh cheese rather than using pre-grated because it melts into a much silkier sauce without the anti-caking agents. Have all your ingredients measured and ready before you begin cooking the sauce, as this dish comes together very quickly once the cream hits the pan.

Add the fettuccine to the boiling salted water and cook for 8-10 minutes, stirring occasionally to prevent sticking. The pasta should have a slight firmness when you bite it—it will continue to cook slightly when tossed with the hot sauce. Drain the pasta in a colander, reserving about 1 cup of the starchy pasta water; this water is liquid gold for adjusting the sauce consistency later if needed.

While the pasta cooks, add the butter to a large pan or skillet and place it over low heat. Pour in the cream slowly, stirring gently to combine as the butter melts; keeping the heat low prevents the cream from breaking or becoming grainy. Once fully combined and smooth, add the garlic salt, salt, and pepper to taste—season carefully as the cheese will add more saltiness.

Increase the heat to medium and add the grated cheese mixture from Step 1, stirring constantly to help it melt smoothly into the cream. The cheese will begin melting within 1-2 minutes; keep stirring to ensure it incorporates fully and the sauce becomes thick and creamy rather than clumpy. Finish by adding a pinch of freshly grated nutmeg—this subtle warmth rounds out the richness beautifully. If the sauce seems too thick, add a splash of the reserved pasta water to loosen it to your preferred consistency.

Add the drained pasta from Step 2 directly to the sauce and toss gently but thoroughly for 30-60 seconds, allowing every strand to coat evenly. The residual heat will continue to cook the pasta slightly and help it absorb the sauce. Plate immediately and serve right away, as this dish is best enjoyed while piping hot—the sauce will thicken as it cools, so don't let it sit.