If your peanut butter balls are too crumbly, then there could be two reasons causing this. One could be excess powdered sugar, and the second could be the lack of butter you powered into this recipe. You should start by adding a tiny bit of butter. If it’s still too crumbly, then scoop in some extra peanut butter. Some peanut butter jars come with an excess of oil-saturated at the top of the container. Don’t avoid this saturation of oil. Instead, mix it into the peanut butter well before scooping it out of the jar to make your Peanut Butter Balls.