I mix together oats, peanut butter, protein powder, some sweetener (agave, honey, sometimes maple syrup if I’m out of the others, I find a liquid sugar helps them stick), and then something with a crunch, maybe chocolate chips, maybe sunflower seeds, and then a little bit of salt and vanilla for flavor (unless the protein powder adds enough flavor already). Mix it well then stick in the fridge till it solidifies enough to mold with your hands, roll into balls, then I usually throw them right back into a container and into the fridge. If you use natural peanut butter, you can add some coconut oil to help them stick a little more.