Disappearing Cake
["1 c. quick-cooking oats", "1 1/2 c. boiling water", "1 stick margarine or butter", "1 c. brown sugar", "1 c. white sugar", "1 1/2 c. flour", "1 tsp. soda", "1/4 tsp. salt", "1 tsp. cinnamon", "1 tsp. vanilla"]
["Mix all ingredients, excluding water, in a large mixing bowl. Add boiling water.", "Pour into a 13 x 9-inch pan and bake for 30 minutes at 350\u00b0.", "Frost."]
["oats", "boiling water", "margarine", "brown sugar", "white sugar", "flour", "soda", "salt", "cinnamon", "vanilla"]