1. In a large mixing bowl, add together the large flake oats, protein powder, peanut butter, honey and hemp hearts. Use a large wooden spoon to stir everything together until smooth.
2. Add in the cocoa nibs, and if the mixture seems dry and crumbly, add 1 teaspoon of water to the mixture and stir together. Add another teaspoon of water if necessary.
3. Using a large cookie scoop or large tablespoon, create balls and roll between your hands to ensure everything is stuck together. Place the balls on a baking sheet lined with parchment paper.
4. Optional Topping: In a microwave safe bowl, melt the coconut oil and chocolate chips together for 30-4o seconds, stirring until smooth. Use a teaspoon to drizzle the chocolate topping over the tops of the protein balls. 
5. Place the peanut butter protein balls in the fridge for 1-2 hours to firm up.

Protein balls can be stored in an airtight container at room temperature for 1-2 weeks, in the fridge for 2-3 weeks or in the freezer for 3-4 months.