Ingredients

• 1 (18.25 ounce) package white cake mix
• 1 (3 ounce) package instant pistachio pudding mix
• 3 eggs
• 1 cup lemon-lime flavored carbonated beverage
• 3/4 cup vegetable oil
• 1/2 cup flaked coconut (optional)
• 1/2 cup chopped walnuts (optional)
• 1 (3 ounce) package instant pistachio pudding mix
• 1 cup milk
• 1 (8 ounce) container frozen whipped topping, thawed