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. Stir thoroughly until the mixture is well blended and uniform in consistency.
03 - Fold in the rolled oats, chopped nuts, chocolate chips or raisins, cinnamon, sea salt, and chia seeds if using. Mix until all ingredients are evenly distributed and the mixture becomes sticky enough to hold together. Adjust consistency by adding more oats if too wet, or an extra spoonful of almond butter if too dry.
04 - Lightly dampen your hands to prevent sticking, then roll tablespoon-sized portions of the mixture between your palms to form 12 uniform bite-sized balls.
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 before serving.
06 - Transfer the chilled energy balls to an airtight container. Store in the refrigerator for up to 5 days, or freeze for up to 2 months for longer shelf life.