Fat-Free Devil'S Food Cake

Directions

1. 1
   Preheat oven to 350°.
2. 2
   Coat 9-inch square baking pan with nonstick cooking spray; set aside.
3. 3
   In large bowl with mixer at medium, beat egg whites, light brown sugar and buttermilk 2 minutes until blended.
4. 4
   Add flour, cocoa powder, baking powder, baking soda, grated peel and vanilla extract.
5. 5
   Beat 1 to 2 minutes until well blended.
6. 6
   Pour into prepared pan; bake 25 to 30 minutes until pick inserted comes out clean.
7. 7
   Cool 15 minutes in pan on wire rack.
8. 8
   Remove cake from pan to wire rack and cool completely, about 30 minutes.
9. 9
   Garnish.
10. 10
    Serve with whipped cream, if desired.