Measure out ingredients and combine in a large mixing bowl. Be sure to weigh out protein powder. It may help to carefully heat the jar of peanut butter in the microwave or a bowl of hot water until it is soft.
Whisk the ingredients together until everything has been incorporated and the mixture becomes dough-like. Scrap the sides of the bowl and mix until no streaks or visible protein powder is seen. Taste the dough before rolling to make sure it is sweet enough. See notes if your mixture is too crumbly.
Begin forming balls by rolling a scoop of the dough between two hands. You can use a cookie scoop to scoop out the dough evenly if you have one. You should be able to make at least 12 protein balls.
If you add too much protein powder and your mixture is not sticking together well you could ad a tablespoon of melted coconut oil or another tablespoon of peanut butter to the mixture to help it bind.Adjust the sweetness to taste. If using an unflavored protein powder you may like to add a bit of vanilla or a little extra sweetener to the mix. Be careful not to add too much liquid sweetener because it could make the consistency too soft.