PREPARATION:
- Spray 9-inch square baking pan with nonstick cooking spray. Stir together graham cracker crumbs, margarine and sugar substitute in small bowl. Press into bottom of pan with fork; set aside.
- Combine cold water and gelatin in small microwavable bowl; let stand 2 minutes. Microwave on HIGH 40 seconds to dissolve gelatin; set aside.
- Combine eggs, lemon juice, sugar and lemon peel in top of double boiler. Cook, stirring constantly, over boiling water, about 4 minutes or until thickened. Remove from heat; stir in gelatin mixture. Refrigerate about 25 minutes or until mixture is thoroughly cooled and begins to set.
- Gently combine lemon-gelatin mixture, whipped topping and lemon yogurt. Pour into prepared crust. Refrigerate 1 hour or until firm. Cut into 9 squares before serving.
