Watergate Pistachio Cake
["1 pkg. white cake mix", "1 small pkg. pistachio pudding mix", "4 eggs", "1/2 c. oil", "1/2 c. walnuts (optional)", "1 c. water"]
["Mix well and bake at 350\u00b0 for 30 to 35 minutes in greased 9 x 13-inch pan or layer."]
["white cake mix", "pistachio pudding mix", "eggs", "oil", "walnuts", "water"]