2 cups nonfat plain yogurt
2 cups milk
2 cups fresh or frozen unsweetened strawberries
6 crushed shortbread cookies
4 teaspoons granular no-calorie sucralose sweetener (e.g., Splenda ®)
1 teaspoon vanilla extract
6 tablespoons whey protein powder (optional)
Place the yogurt, milk, strawberries, cookies, sweetener, vanilla, and optional protein powder into a blender. Cover, and puree until smooth. Pour into glasses to serve.