Prepare crust: Preheat oven to 350°F. Coat a 9-inch pie plate with nonstick cooking spray. In a medium bowl, combine finely crushed rusk and brown sugar. Add egg white and melted butter; stir until well mixed. Press mixture evenly onto bottom and up side of prepared pie plate. Bake for 10 to 12 minutes or until edge is browned. Cool completely on a wire rack.
Prepare filling: In a small bowl, combine yogurt, powdered sugar, and vanilla. Cover and chill until ready to use.
Meanwhile, prepare glaze: In a small saucepan, stir together cranberry-raspberry drink and cornstarch. Cook and stir over medium heat until thickened and bubbly; cook and stir for 2 minutes more. Remove from heat. Transfer to a small bowl. Cover surface with plastic wrap; let stand at room temperature for 1 to 2 hours or until cooled.
Spread yogurt mixture into crust-lined pie plate. In a large bowl, gently toss berries and cooled glaze. Spoon over yogurt mixture. Cover with foil; chill for 3 to 6 hours before serving.
Prepare lemon topping: In a small bowl, combine whipped dessert topping and lemon peel.
Serve each slice with fresh mint (optional) and lemon topping.