In a large mixing bowl, combine rolled oats and ground flaxseed.
Add nut butter and honey (or maple syrup) to the dry ingredients.
Mix in chocolate chips or dried fruits for sweetness.
Stir in chia seeds and vanilla extract until well combined.
Season with a pinch of salt to enhance flavor.
Use your hands to form the mixture into small balls, about 1 inch in diameter.
Place the energy balls on a baking sheet lined with parchment paper.
Refrigerate for at least 30 minutes to firm up.
Once set, transfer to an airtight container.
Enjoy immediately or store for later snacking.