Sift dry ingredients together. Rub in butter. Beat egg whites and vanilla until frothy. Stir into flour mixture with a fork. Add a little water if necessary. Roll dough on floured surface to fit a ( inch springform pan or pie plate. Prick with fork. Bake at 350°F for 15 minutes. Cool. Yield: 1, 9 inch crust.
VARIATION: for a sugarless chocolate Sweet Dough Crust, use 3/4 cup flour, 1/4 cup cocoa and 1/2 cup Splenda Granular, plus the remaining ingredients above.