Sure. It's a common way of making salad dressings, Waldorf and otherwise.

The original Waldorf salad used only may, not sour cream, but the sour cream would add a nice tang to the recipe, especially if your apples aren't too sour.

The original recipe, and some variants using sour cream, are at the source below.
Source(s):
http://www.kitchenproject.com/history/Waldorf_Salad.htm


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