Aunt Becky's Chocolate Sheet Cake

2 c. SR flour
2 c. sugar
1 stick margarine, soft
4 T. cocoa
1/2 c. cold water
1/2 c. canola oil
2 eggs, beaten
1/2 c. buttermilk
1 t. vanilla

Topping:

1/2 c. chocolate chips
1 stick margarine
4 T. cocoa or 6 oz. chocolate chips
1 box confectioners sugar
1 t. vanilla
6 T. milk

Combine flour and sugar. Boil margarine, cocoa, cold water, and oil. Add to flour mixture. Add beaten eggs, buttermilk, and vanilla. Stir. Do not beat! Pour in sprayed 9x13 dish. Bake at 400 degrees for 20 minutes. Make icing while cake bakes. Melt margarine, chocolate chips, cocoa (or 6 oz. chips). Add confectioners sugar, vanilla, and milk. Pour over hot cake : )

*My aunt made this every Thanksgiving and Christmas : )