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Step 1
Try reducing some of the liquid out of over a low heat. This can be done by simmering for 5 to 7 minutes and stirring frequently.
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Step 2
Adding a little flour or cornstarch will help thicken it without added flavor.
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Step 3
Whisk in an egg yolk and simmer for at least 3 to 5 minutes to ensure the egg is cooked.
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Step 4
Use parmesan cheese because it is one of the best choices. It is typically always a main ingredient, so you're less likely to alter the flavor significantly.
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Step 5
Adding either plain or a flavored cream cheese will immediately thicken the sauce. This will also add a richer flavor.








