Chocolate Cookie Sheet Cake
["2 c. flour", "2 c. sugar", "1/2 tsp. salt", "1 stick margarine", "1/2 c. shortening", "1 c. water", "3 Tbsp. cocoa", "2 eggs, well beaten", "1 tsp. soda", "1/2 c. buttermilk", "1 tsp. vanilla", "1 tsp. cinnamon (optional)"]
["Sift flour; measure.", "Re-sift with sugar and salt.", "Place margarine, shortening, water and cocoa in a saucepan.", "Bring to a boil.", "Pour over flour and sugar mixture.", "Combine eggs, soda, buttermilk and vanilla in another bowl.", "Add to mixture; mix well.", "Pour into greased and floured shallow 11 x 17-inch pan. Bake 20 minutes at 350\u00b0.", "Start frosting the last five minutes the cake is baking."]
["flour", "sugar", "salt", "margarine", "shortening", "water", "cocoa", "eggs", "soda", "buttermilk", "vanilla", "cinnamon"]