01 - In a large mixing bowl, mash the banana until smooth using a fork or potato masher.
02 - Stir in the almond butter and vanilla extract until well combined and creamy.
03 - Add the oats, nuts, chocolate chips or raisins, cinnamon, salt, and chia seeds if using. Mix until the mixture is sticky and holds together. Adjust consistency by adding more oats if too wet or more almond butter if too dry.
04 - Using slightly damp hands, roll the mixture into 12 bite-sized balls.
05 - Place energy balls on a parchment-lined tray and chill in the refrigerator for at least 30 minutes for best texture.
06 - Store in an airtight container in the fridge for up to 5 days, or freeze for up to 2 months.