Easy Sweet Potato Cake
["1 pkg. yellow cake mix", "1/2 c. vegetable oil", "4 eggs", "1/2 c. water", "3/4 c. sugar", "1 c. sweet potato", "1 tsp. cinnamon", "1 stick (1/2 c.) butter", "1 (3 oz.) pkg. cream cheese", "1 pkg. confectioners sugar", "1 tsp. vanilla", "1 c. nuts"]
["Combine cake mix, oil, eggs, sugar, sweet potato, cinnamon and water.", "Mix well and bake at 350\u00b0 for 35 minutes.", "Let cool."]
["yellow cake mix", "vegetable oil", "eggs", "water", "sugar", "sweet potato", "cinnamon", "butter", "cream cheese", "confectioners sugar", "vanilla", "nuts"]