Heat water in microwave in measuring cup until boiling. Add gelatin, stirring
with fork until dissolved. Pour gelatin into large bowl. Add yogurt, and whisk
together until smooth. Add container of sugar-free Cool Whip; stir until smooth.
Pour into prepared shortbread pie crust or, to skip additional calories or carbs,
serve in dessert cups.
Refrigerate 2 hours or overnight before serving.
Garnish with additional sugar-free Cool Whip when serving.