Put all ingredients, except chocolate chips, in a bowl and mix well until oats are well incorporated. (if peanut butter when measured is quite hard, microwave for 10 seconds so it mixes together better) Fold in chocolate chips (or other add ins of choice) and incorporate again.
Use a small cookie scoop or a heaping tbsp to scoop out even sized scoops, roll with hands in balls. (if too sticky add a pinch more oats) Place in a storage container with a sealed lid and store in the fridge. Enjoy within 1 week. Keep sealed.
Notes
Other optional add ins would be;
2 tbsp of sunflower seeds or pepitas (pumpkin seeds without the shells)