In a large mixing bowl, combine oats, flaxseed, coconut, cinnamon, and salt.
Add peanut butter, honey, and vanilla extract to the dry ingredients.
Mix everything together until well combined and mixture holds together when pressed.
Fold in chocolate chips and chia seeds if using.
Cover bowl and refrigerate for 30 minutes to firm up the mixture.
Using clean hands or a small cookie scoop, roll mixture into 1-inch balls.
Place energy balls on a parchment-lined baking sheet or plate.
Refrigerate for another 15 minutes to set completely.
Store in refrigerator in an airtight container for up to 1 week.
Let sit at room temperature for 5 minutes before eating for best texture.
