The Easy Way To Thicken Alfredo Sauce Without Using Flour - Tasting Table
Briefly

To salvage a thin Alfredo sauce, simply add more cheese to thicken it, rather than using flour which can alter the flavor profile.
Finely grated cheese melts into the sauce quicker, and using fresh cheese rather than pre-shredded will help achieve a smooth consistency.
Experiment with different cheese varieties like Pecorino Romano or adding cream cheese for an extra creamy texture and tangy flavor in Alfredo.
It's essential to incorporate cheese slowly while simmering, stirring constantly until the Alfredo sauce reaches the desired thickness.
Read at Tasting Table
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