01 - In a large mixing bowl, mash the banana until completely 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 thoroughly 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 evenly sized bite-sized balls.
05 - Place the energy balls on a parchment-lined tray and refrigerate for at least 30 minutes to firm up for the best texture.
06 - Transfer to an airtight container and store in the refrigerator for up to 5 days, or freeze for up to 2 months.