In a large mixing bowl, combine the rolled oats, ground flaxseed, and salt.
Add the peanut butter, honey, and vanilla extract. Stir with a sturdy spoon or rubber spatula until the mixture is thick and well combined.
Fold in the mini dark chocolate chips until evenly distributed.
Cover and chill the mixture in the refrigerator for at least 30 minutes — this makes it easier to roll.
Once chilled, scoop out about 1 tablespoon of the mixture and roll into a compact ball using your hands.
Optional: Roll each ball in shredded coconut for added texture and flavor.
Store in an airtight container in the refrigerator for up to 1 week or freeze for up to 2 months.
Let sit at room temperature for a few minutes before eating if stored in the freezer for best texture.