Jello Pistachio Cake
["1 pkg. (2 layer size) white or yellow cake mix", "1 pkg. Jell-O pistachio flavor instant pudding", "3 eggs", "1 c. club soda", "1 c. oil", "1/2 c. chopped nuts (optional)"]
["Blend all ingredients in large mixer bowl, then beat 2 minutes at medium speed.", "Bake in greased, floured 10-inch Bundt pan at 350\u00b0 for 50 minutes."]
["layer", "eggs", "club soda", "oil", "nuts"]