Chocolate Sheet Cake

Directions

1. 1
   Lightly grease and flour a 15 x 10 x 1-inch baking pan, then set aside.
2. 2
   In a large mixer bowl, stir together flour, sugar and soda.
3. 3
   In a medium saucepan, combine water, margarine and cocoa powder.
4. 4
   Bring just to boiling, stirring constantly.
5. 5
   Remove from the heat.
6. 6
   Add to dry ingredients, beating on low speed of electric mixer just until combined.
7. 7
   Add buttermilk, egg white, egg and vanilla.
8. 8
   Beat on low speed for 1 minute (batter will be thin).
9. 9
   Pour into the prepared pan.
10. 10
    Bake in a 350° oven for 20 to 25 minutes or until a toothpick inserted near the center comes out clean.
11. 11
    Cool completely.