In a sizable mixing bowl, combine the natural peanut butter, honey (or maple syrup), and vanilla extract. Use a sturdy spatula to stir until the mixture is smooth and fully integrated.
Gradually incorporate the rolled oats, chocolate protein powder, ground flaxseed, and a pinch of sea salt. Continue mixing with the spatula or your hands until the mixture forms a sticky dough that holds together well.
Gently fold in the dark chocolate chips, making sure they are evenly distributed throughout the dough.
Using your hands, scoop up portions of the mixture and roll them into small balls, approximately 1 inch in diameter. Arrange the balls on a baking sheet lined with parchment paper for easy removal.
Once you have shaped all the dough into balls, place the baking sheet in the refrigerator for at least 30 minutes. This will allow the protein balls to firm up nicely.
After chilling, transfer the protein balls to an airtight container. They can be enjoyed right away, but they will keep fresh in the fridge for up to 1 week.
Notes
For a delightful touch, serve the protein balls on a colorful platter and garnish with a sprinkle of cocoa powder or crushed nuts.