Add the peanut butter, butter, sweetener, and vanilla to a mixing bowl and beat on medium speed until well combined.
Stir in the chocolate chip by hand.
Use a small cookie scoop to scoop out 24 balls of dough. Roll the dough between your hands to shape into a ball.
Place on a baking sheet in the refrigerator to firm up for one hour.
Store tightly covered in the refrigerator.
Notes
I've received a few comments from readers that these peanut butter balls are too sweet. I recommend starting with 1/2 cup of powdered sweetener and tasting for sweetness. You may need to add peanut butter powder or coconut flour to bring the mixture together, depending on the amount of sweetener used. I use closer to 2 cups with Lakanto powdered sweetener and don't find it too sweet, but many are finding this to be too much - I'm not sure if it's the brand of sweetener coming into play or just different tolerances for sweetness, so start slow and adjust as needed.I used a low carb peanut butter (Skippy Naturals) with just 4 net carbs per 2 tablespoons. Your nutrition information will vary based on the products you use. Be sure to use the no-stir type of peanut butter.