Good-Cooking - Watergate Cake with Cover-Up Frosting

Ingredients

• 1 (18 1/4 ounce) box plain white cake mix
• 1 (3.4 ounce) box instant pistachio pudding mix
• 1 cup vegetable oil
• 1 cup ginger ale
• 3 large eggs
• 1 1/2 cup milk
• 1 (8 ounce) carton frozen whipped topping, thawed