Categories: Chocolate, Low-cal, Cakes/choc. 
      Yield: 6 servings 
  
      1 c  Sifted cake flour                   6 lg Egg whites 
    1/3 c  Unsweetened cocoa               1 1/3 c  Firmly packed brown sugar 
      1 ts Baking soda                         1 c  Unflavored non-fat yogurt 
      1 ts Baking powder                       1 ts Vanilla 
  
  Deceptively rich tasting, this cake is less than meets the eye. It packs in 
  flavor without fat.  Whipped egg whites and non-fat yogurt lighten up this 
  version of the classic chocolate cake. 
   
  Powdered sugar (for sifting on top when finished) 
   
  Preheat oven to 350 degrees.  Mix flour, cocoa, baking soda and baking 
  powder.  In a lg bowl, beat whites, brown sugar yogurt and vanilla until 
  well blended. Stir in flour mixture and beat until evenly moistened. 
   
  Pour batter into a nonstick 8-inch square pan (or coat an