Once the mixture has blended and thickened - about 4 to 5 minutes - then gradually whisk in the sour cream. Whisk briskly so that your sauce doesn't separate. Add the parsley right at the end and salt and pepper your sauce to taste. You may also choose to use Greek Yogurt, the unflavored type, instead of sour cream. For those who prefer a little tangier sauce or those on a lower-calorie diet, this is a better option than sour cream.

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