Rhubarb Cake
["1 1/2 c. brown sugar", "1/2 c. margarine", "1 egg", "1 c. buttermilk", "2 c. flour", "1 tsp. soda", "1 tsp. vanilla", "1/2 tsp. salt", "1 1/2 c. cut up rhubarb", "1/2 c. white sugar", "1 tsp. cinnamon"]
["Mix all ingredients together except last 2.", "Grease 9 x 13-inch glass pan.", "Pour in mixture; spread evenly.", "Mix together 1/2 cup sugar and 1 teaspoon cinnamon; sprinkle over mixture. Bake at 350\u00b0 for 35 minutes.", "Serve with whipped cream or Cool Whip."]
["brown sugar", "margarine", "egg", "buttermilk", "flour", "soda", "vanilla", "salt", "rhubarb", "white sugar", "cinnamon"]