1. Beat heavy cream and confectioners sugar until stiff peaks form. Stir yogurt until very smooth, then fold into whipped cream. Chill until proceeding with assembly, but prepare no more than 4 hours ahead.Fruit:
2. In a large bowl, toss together the strawberries, raspberries, blueberries, sugar and liqueur, if using. Refrigerate until serving.To Serve:
3. Remove cream filling and berry mixture from refrigerator. Add mint to berries. Divide cream filling evenly among dessert shells. Top with fresh berries.