This cool and creamy custard pie is too good to reserve only for times of indulgence. At least that’s how we feel, and it's the reason we developed this lower-calorie recipe. Its limey flavor comes from the inclusion of juice, zest and one secret shortcut ingredient: Yoplait® Light Thick & Creamy Key lime pie yogurt. Adding in yogurt, along with fat-free cream cheese and Cool Whip lite, helped us recreate the trademark creamy texture and rich flavor of this pie, while avoiding the higher-calorie evaporated milk and whipped cream used in the traditional recipe. The result of these smart swaps is a 200-calorie treat that’s earned approval from well over 100 of your fellow home cooks.