What if you already messed up? What if your sauce looks like a greasy, curdled mess? Take a deep breath. It’s not dead yet. Put the pan over low heat and whisk in a splash of warm milk super fast.
You can also drop an ice cube in it while whisking. Sounds crazy, right? The cold shock can re-emulsify the fats. It’s a magic trick. But use it only in emergencies, because nobody wants an ice cube in their Alfredo.
If that fails? Add more fresh cream and stir like your life depends on it. You’ll fix it. You’re a sauce ninja.