Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   3 1/3  cups          all-purpose flour
     1/2  cup           unsweetened cocoa powder -- sifted
   1 1/2  teaspoons     baking soda
     1/2  teaspoon      salt
   1 1/2  cups          granulated sugar
     1/2  cup           plain nonfat yogurt -- (amaretto flavored)
   2                    egg whites
   1      tablespoon    vanilla extract
   1      tablespoon    white vinegar
   2      tablespoons   confectioner's sugar

Preparation:

Preheat over to 350 degrees. Spray a 13-9 inch baking pan with nonstick cooking spray. In a large bowl, with an electric mixer at medium speed, beat the granulated sugar, yogurt, egg whites, vanilla and vinegar until fluffy, about 2 minutes. With the mixer at low speed, gradually add the flour mixture; stir until just combined (do not overmix). Add 2 cups water and stir until just smooth. Pour the batter into the pan. Bake until a toothpick inserted in the center comes out clean, about 40 minutes. cool completely in the pan on a rack. Dust with confectioner's suga