CHOCOLATE SHEET CAKE - LOWER IN FAT

2 c. all purpose flour 
1-3/4 c. sugar
1 tsp. baking soda
1-1/3 c. water
1/2 c. butter
1/3 c. unsweetened coco powder
1/2 c. buttermilk
2 egg whites
1 egg
2 tsp. vanilla

Preheat oven to 350 degrees.

Spray a 15 x 10 x 1-inch baking sheet with nonstick spray. Mix together flour, sugar and soda.

In a medium saucepan, combine water, butter and cocoa powder.  Bring to a low boil, stirring constantly. Remove from heat and add this to the dry ingredients. Beat on low with an electric mixture until everything is combined.

Add buttermilk, egg whites, egg and vanilla. Beat on low for about 1 minute. Batter will be a bit thin.

Pour into pan and bake for 20-25 minutes.