1. With a mixer, combine limeade, yogurt, and cream cheese until MOST lumps are gone (we like some lumps).
2. Fold in whipped topping.
3. Carefully spread in crust.
4. Refrigerate at least 4 hours or until set.
5. Garnish as desired (candied lime peels, candied lime slices, lime syrup). Store in refrigerator.