Line a baking sheet with parchment paper and set it aside.
In a large mixing bowl, add the peanut butter, honey (or maple syrup), and vanilla extract.
Stir until smooth and fully combined.
Add the protein powder, rolled oats, chia seeds, and salt to the bowl.
Mix thoroughly until a thick, cohesive dough forms.
Fold in dark chocolate chips if using.
If the mixture feels too dry, add 1–2 tablespoons of water or milk.
If too sticky, add a small amount of oats or protein powder.
Use a tablespoon or cookie scoop to portion the mixture.
Roll each portion into a smooth ball using your hands.
Place the balls onto the prepared baking sheet.
Refrigerate for 30 minutes to firm up before serving.