Spread lemon curd over cooled crust. In large bowl, beat cream cheese, marshmallow creme and yogurt with wooden spoon until well blended. Fold in whipped topping. Spread over lemon curd, swirling to look like meringue topping. Refrigerate at least 1 hour until serving time. For bars, cut into 6 rows by 4 rows. Store in refrigerator.