Texas Sheet Cake and Frosting

Ingredients

Mix well:
2 cups sugar
1/2 cup sour cream
2 cups flour
1/2 tsp. salt
2 eggs
1 tsp. baking soda
Bring to a boil:
2 cubes margarine, 1 cup water, 4 Tbl. Cocoa
Add liquid to flour mixture and beat well. Spread on a greased cookie sheet. Bake at 350° for 20 minutes.
FROSTING: Cream 1/2 cup butter, 1/4 cup cocoa. Add: 6 TBL canned milk, 1 tsp. vanilla, and l lb. powdered sugar.

As per above