1 frozen banana
1 cup skim milk or unsweetened almond milk
1 tbsp all natural creamy peanut butter
2 tbsp PB2 peanut butter powder (amazing ingredient, more details below)
1/4 cup 100% liquid egg whites (optional extra protein or 1/4 cup water)
1/2 scoop vanilla protein powder (or chocolate protein for chocolate pb!)
Note: There are two ingredients I will introduce to you. There is nothing more frustrating than finding a great recipe, but are unable to try it because there are ingredients on there that you've never heard of. I am going to show you what PB2 and liquid egg whites are.

PB2 is pretty much powdered peanut butter. The reason I find it so amazing is because there isn't nearly as much fat in it. You could replace your real peanut butter for this by adding water to the powder and spreading it on toast. 2 tbsp of peanut butter is around 200 calories. 2 tbsp of PB2 is only 45 calories!
Liquid Egg Whites are a low calorie way to add protein to any shake. Only 25 calories and it's just protein. Better yet, 5 grams of protein!