In a large bowl, combine the potatoes, cheese and sour cream, chives and salt.  Beat egg yolks and stir into potato mixture.  In a small mixing bowl, beat egg whites until stiff peaks form and gently fold  into the mixture.  Transfer to a greased 1-1/2 qt. baking dish.  Bake, uncovered at 350 for 45 minutes.  Serve immediately.

The chives add a zesty flavor.  Chives can be used fresh, dried or frozen interchangeably and in the same amounts in recipes.