Add oats and pumpkin seeds to a food processor and pulse a few times.
Add peanut butter, protein powder, honey, vanilla, cinnamon, flaxseed, dates, and salt.
Process until the mixture comes together and is as smooth as possible, stopping to scrape down the sides as needed. This may take 3–4 processing rounds.
If using chocolate chips or puffed quinoa, allow the mixture to cool slightly first, then fold them in.
Using a 2-tablespoon scoop, portion the mixture and roll between your hands to form balls.
Store in an airtight container.