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Bring egg whites to room temperature.
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Sift together the potato starch, cornstarch, and 1 3/4 cup Splenda; set aside.
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In large mixer bowl, combine egg whites, salt, cream of tartar, and vanilla extract.
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Beat on high speed until stiff and stand in peaks. This takes 1 1/2 to 2 minutes.
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Do Not Overbeat.
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Turn mixer to lowest speed and sprinkle in the sifted flour mixture for 1 1/2 minutes.
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Carefully pour (using a rubber spatula) cake batter into the ungreased 10-inch tube pan.
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Bake at 375° for 35 minutes.
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Do not under bake as it will sink on you after baking.
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It is better to over bake this cake than under bake.
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The top can be well browned.
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Remove from oven and turn upside down on counter to cool.
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I place it on a sturdy bottle with a small enough neck that it fits through the center hole of the pan.
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This cake rises quite high.
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Let cool completely before using or freezing.