Blend on high until completely combined and frothy.
Pour into a serving glass and add a straw and fresh lemon slice (optional).
Serve and enjoy!
Notes
Note: The nutritional information reflects the use of full sugar lemonade. If you're using sugar-free or diet lemonade, the numbers change significantly. Extra creamy: The ice and protein powder blend to create a creamy "frosted" effect, but if you like it extra creamy try adding a splash of unsweetened almond milk, coffee creamer, or a scoop of your favorite protein ice cream. Sugar free: This recipe tastes great when made with bottled sugar-free lemonade (our favorite in testing was Minute Maid).Flavor variations: Use different flavors of lemonade (strawberry lemonade, limeade, etc) to switch up the flavor, OR add ¼-⅓ cup of soft fruit to the blender (like strawberry, blueberry, raspberry, watermelon, etc).Protein powder: This makes or breaks the recipe, so be sure to use your favorite vanilla protein powder that has a great flavor.