Chocolate Sheet Cake
["2 c. flour", "2 c. sugar", "1 tsp. soda", "1 tsp. cinnamon", "1 stick margarine", "1 sq. chocolate", "1 c. water", "2 eggs, beaten", "1/2 c. buttermilk"]
["Mix and add to other ingredients. Hand beat until all are mixed well. Bake at 350\u00b0 approximately 20 minutes in 13 1/2 x 9-inch pan. Check for doneness with a straw."]
["flour", "sugar", "soda", "cinnamon", "margarine", "chocolate", "water", "eggs", "buttermilk"]