Why does my Alfredo sauce get grainy or clump?
Usually it is heat and timing. If the sauce is bubbling hard when the Parmesan goes in (or if you keep cooking it aggressively after), the cheese can seize and turn grainy. Keep the pan on low, add cheese gradually, and stir constantly. Also use freshly grated Parmesan. Pre-shredded cheese often has anti-caking agents that can make the sauce less smooth.
Can I use milk instead of heavy cream?
You can, but it will be thinner and easier to break. If you want a lighter option, use half-and-half and add a tablespoon of cream cheese for stability. Keep the heat low.
What Parmesan is closest to that restaurant-style flavor?
A good-quality Parmesan (Parmigiano-Reggiano if you can swing it) plus a little Romano gives you that punchy, restaurant-style finish. The recipe includes an optional Romano boost.
How do I thicken Alfredo if it is too thin?
Simmer gently for 1 to 2 minutes, stirring, and add a little more Parmesan. If you added too much pasta water, just keep stirring over low heat until it reduces and coats the noodles.
How do I fix Alfredo if it is too thick?
Easy. Add reserved pasta water a tablespoon at a time until it turns silky again. If you forgot to reserve it, use warm water or a splash of milk.
Can I add chicken or shrimp?
Absolutely. Season cooked chicken or sautéed shrimp with salt, pepper, and a pinch of garlic powder, then toss it in at the end so it stays juicy and does not overcook.