In a large mixing bowl, add the whole rolled oats, creamy natural peanut butter, ground flaxseed, honey, protein powder, and vanilla extract.
Using a spatula, mix the ingredients together until well combined. If the mixture seems too dry, add a little more honey or a splash of water.
Once the mixture is combined, gently fold in the mini chocolate chips until evenly distributed.
Scoop out about a tablespoon of the mixture and roll it into a ball. Continue until all the mixture is used.
Place the rolled protein balls on a parchment-lined baking sheet and refrigerate for at least 30 minutes to firm up.