the heat is too high or when the cheese is added too quickly. Lower the heat before adding Parmesan and stir in small portions.
Packaged grated cheese may also contain additives that affect melting, which is why freshly grated Parmesan is recommended.
<h3>Can I make this recipe without flour?</h3>
Yes. The flour creates a light crust and helps thicken the sauce, but it can be omitted. The sauce may need a few extra minutes of gentle simmering to reach the desired consistency.
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