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