Tip: Another recipe with the exact-same name "Key Lime Pie" ranks higher.
1. In microwave-safe measuring cup heat water on high (100% power) for 45 seconds to 1 1/2 minutes or until boiling. Whisk in gelatin until dissolved.
2. In large bowl whisk together gelatin mixture and yogurt. Fold in whipped topping. Carefully spread in crust. Refrigerate at least 4 hours or until set.
3. Garnish as desired. Store in refrigerator.