Mix Dry Ingredients: Combine the rolled oats and protein powder in a large mixing bowl. Stir until well mixed.
Add Wet Ingredients: Add the peanut butter and honey (or maple syrup) to the dry mixture. Stir until the mixture comes together into a thick dough. If it's too dry, add a bit more honey or peanut butter; if it's too sticky, sprinkle in a few more oats.
Incorporate Mix-Ins: If you're adding chocolate chips or other mix-ins, fold them into the dough until evenly distributed.
Form Balls: Using your hands or a small cookie scoop, portion out the dough and roll it into balls about 1 inch in diameter.
Set and Store: Place the formed balls on a baking sheet lined with parchment paper. Refrigerate for about 30 minutes to firm up. Once set, transfer them to an airtight container.