In a large mixing bowl, combine the peanut butter, honey (or maple syrup), and vanilla extract. Stir until smooth and well combined.
Add the rolled oats, chocolate protein powder, ground flaxseed, and sea salt to the mixture. Mix thoroughly until all ingredients are well incorporated.
If using, fold in the mini chocolate chips for a little extra sweetness and texture.
Once the mixture is combined, use your hands to form small balls, about 1 inch in diameter. If the mixture is too sticky, you can wet your hands slightly to make rolling easier.
Place the formed balls onto a baking sheet lined with parchment paper.
Once all the balls are formed, place the baking sheet in the refrigerator for at least 30 minutes to firm up.
After chilling, you can transfer the protein balls to an airtight container for storage. They can be kept in the fridge for up to a week or frozen for longer storage.
Notes
These can be stored in the fridge for up to a week or frozen for longer storage.