"Fettuccine Alfredo is one of the easiest pasta dishes you'll ever make. Consisting of Parmigiano Reggiano, butter, pasta water, a touch of heavy cream, and fettuccine, this can be made in under 30 minutes...."
INGREDIENTS
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1 stick unsalted butter (cubed)
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1 cup Parmigiano Reggiano (finely grated, plus more for serving)
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1 cup reserved pasta water (might not need it all but reserve just in case)
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kosher salt (to taste)
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1/4 cup heavy cream (optional)