In a large mixing bowl, combine peanut butter and honey.
Add the rolled oats and mix until well combined.
Stir in the protein powder until evenly distributed.
Add vanilla extract and a pinch of salt.
Fold in mini chocolate chips and chopped nuts if desired.
Form the mixture into small balls, about 1 inch in diameter.
Place the balls on a baking sheet lined with parchment paper.
Refrigerate for at least 30 minutes to firm up.
Transfer to an airtight container after setting.
Store in the refrigerator for up to 1 week or freeze for longer storage.