Line a small baking sheet or large plate with parchment paper or non-stick baking mat.
Put the peanut butter, almond flour, monk fruit sweetener, and vanilla into a small bowl. Mix until combined.
Form into 8 medium-sized balls, rolling in the palm of your hand and arrange on parchment-lined baking sheet. Place peanut butter balls in freezer for at least 30 minutes before serving.
Recipe can be doubled or tripled, and leftover peanut butter balls can be stored in the freezer. Enjoy!