Add the rolled oats, peanut butter, ground flaxseed, honey, protein powder, vanilla extract, chocolate chips, and sea salt to a large bowl.
Mix thoroughly until fully combined. The mixture will be thick and slightly sticky.
Use a 2-tablespoon cookie scoop to portion the mixture.
Roll each portion between your hands to form smooth balls.
Place the protein balls on a plate or tray and refrigerate for 1 to 2 hours, or until firm.
Transfer to an airtight container and store in the refrigerator for up to one week.
For longer storage, freeze and thaw as needed.
