01 - In a large mixing bowl, mash the ripe banana with a fork or potato masher until completely smooth and free of large lumps.
02 - Add the almond butter and vanilla extract to the mashed banana, stirring until well blended and creamy.
03 - Fold in the 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 uniform bite-sized balls, approximately 1 1/2 inches in diameter.
05 - Arrange the energy balls on a parchment-lined baking sheet or plate and refrigerate for at least 30 minutes to firm up the texture.
06 - Transfer to an airtight container and store in the refrigerator for up to 5 days, or freeze for up to 2 months for longer shelf life.