Traditional Chocolate Sheet Cake

Directions

1. 1
   Preheat oven to 350 degrees.
2. 2
   Grease a 15 x 10 x 1 inch Jelly Roll pan, set aside.
3. 3
   Sift together flour, baking soda and salt.
4. 4
   In a saucepan combine butter, water and cocoa.
5. 5
   Heat until butter is melted.
6. 6
   Remove from heat, add in sugar, eggs, sour cream and vanilla, blending well.
7. 7
   Carefully whisk in flour a little at a time, making sure there are no lumps.
8. 8
   Pour batter into jelly roll pan, spreading batter to all sides and corners.
9. 9
   Bake for 20 minutes or until toothpick comes out clean.
10. 10
    For the icing:.
11. 11
    Combine butter, cocoa and milk in saucepan, bring to a boil.
12. 12
    Remove from heat and add in vanilla and powdered sugar.
13. 13
    Mix well.