01 - In a large mixing bowl, mash the 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 vigorously until the mixture is uniform and creamy.
03 - Fold in the rolled oats, chopped nuts, chocolate chips or raisins, cinnamon, sea salt, and chia seeds if using. Mix thoroughly until all ingredients are evenly distributed and the mixture holds together when pressed. Adjust consistency by adding more oats if too wet or more almond butter if too dry.
04 - With slightly damp hands to prevent sticking, portion the mixture and roll into 12 uniform bite-sized balls, pressing firmly to compact each one.
05 - Arrange the energy balls on a parchment-lined tray and refrigerate for at least 30 minutes to allow them to firm up and develop 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 for longer preservation.