Berry Pie with Creamy Filling

Name: Berry Pie with Creamy Filling
Ingredients: Nonstick cooking spray; 1 ⅓ cups finely crushed rusk (10 to 12 slices) or zwieback (about 17 slices); 2 tablespoons packed brown sugar; 1 egg white, lightly beaten; 2 tablespoons butter, melted; 2 cups plain fat-free Greek yogurt; 2 tablespoons powdered sugar; ½ teaspoon vanilla; ¾ cup low-calorie cranberry-raspberry drink; 1 tablespoon cornstarch; 6 cups fresh raspberries, blackberries, blueberries, and/or halved strawberries; 1 ½ cups frozen light whipped dessert topping, thawed; ¾ teaspoon finely shredded lemon peel; 1 sprig Fresh mint sprigs