instead of heavy cream?
Whole milk can be used, but the sauce will be thinner and less rich. Because milk is more likely to separate under high heat, keep the temperature low and avoid boiling it.
For a result closer to the original recipe, half-and-half is generally a better substitute than regular milk.
Why did my Parmesan sauce become grainy?
A sauce can become grainy when the heat is too high or when the cheese is added too quickly. Lower the heat before adding Parmesan and stir in small portions.
