1. Whisk together lemon juice and condensed milk in medium bowl.
2. Whip cream with electric mixer in separate bowl until soft peaks form. Whisk yogurt into whipped cream. Fold cream mixture into lemon juice mixture. Chill 1 hour, or until firm.
3. Layer 1/3 cup cream mixture and 7 cookies in each of 8 parfait glasses or ramekins. Chill 4 hours before serving.