In a large mixing bowl, combine rolled oats, almond butter, honey, vanilla protein powder, and peppermint extract. Mix until well combined.

If the mixture is too dry, gradually add unsweetened almond milk until it's moist enough to roll into balls.

Fold in mini dark chocolate chips until evenly distributed.

Using clean hands, scoop about one tablespoon of mixture and roll into a ball. Repeat until all mixture is used.

Chill the formed balls in the refrigerator for at least 20 minutes to firm up.

Store the protein balls in an airtight container in the refrigerator.