Cookie Sheet Chocolate Cake
["2 sticks (1 c.) butter", "1 c. water", "2 c. sugar", "2 c. flour", "1/2 tsp. salt", "3 Tbsp. cocoa", "1/2 c. buttermilk", "2 eggs", "1 tsp. baking soda", "1 tsp. vanilla"]
["Melt butter in skillet.", "Combine sugar, flour and salt.", "Add cocoa to butter and stir this mixture into the combined dry ingredients, also adding water.", "Add eggs, baking soda and vanilla. Mix thoroughly and pour into greased cookie sheet pan.", "Bake at 350\u00b0 for 20 to 25 minutes.", "Make frosting."]
["butter", "water", "sugar", "flour", "salt", "cocoa", "buttermilk", "eggs", "baking soda", "vanilla"]