In a medium-sized mixing bowl, combine all of the dry ingredients - rolled oats, ground flax seed, chia seeds, sea salt, chopped almonds, and chopped dark chocolate chips. Mix well.
Add the wet ingredients to the bowl - almond butter, pure maple syrup, melted coconut oil, and pure vanilla extract. Mix everything together until a dough forms.
Cover the bowl with plastic wrap or a lid and refrigerate for 1-2 hours. This will allow the oats to soak up some of the liquid and firm up the mixture.
Once the mixture has chilled and firmed up, use a small cookie scoop or tablespoon to roll the dough into 15 evenly-sized balls. Wet your hands with water to prevent sticking while rolling.
Place the energy balls into an airtight container and refrigerate for at least one day before eating. This will help the flavors meld together and the texture to become denser.