1 graham cracker crust (6 oz.)
1 (3 oz.) pkg. sugar-free lime flavored jello
1/4 c. boiling water
2 (6 oz.) containers light Key lime yogurt
1 (8 oz.) container fat-free whipped topping

In large bowl, dissolve gelatin in boiling water. Stir in yogurt with wire whisk. Fold in whipped topping with wooden spoon. Spread in crust. Refrigerate overnight or at least 2 hours. Garnish as desired. Refrigerate leftovers.