Add all of the ingredients to a medium sized bowl and mix well until everything is combined.
Roll into 1 1/2 inch balls and set them on a parchment lined baking sheet. Wet your hands slightly after every 4 balls or so to help keep the mixture from sticking to your hands.
Refrigerate for 20 minutes to help them harden (optional).
Store the leftovers in the fridge.
Notes
If the mixture is too crumbly, add a bit more peanut butter. If the mixture is too wet, add some more oats.