01 - Add the bananas, Greek yogurt, milk, and optional sweetener to a blender jar.
02 - Sprinkle in vanilla extract, cinnamon, seeds, and a handful of ice cubes if desired.
03 - Blend on high speed until completely smooth and creamy, approximately 45-60 seconds.
04 - Taste the smoothie and adjust sweetness or thickness by incorporating additional milk or honey as needed.
05 - Pour evenly into two glasses and enjoy right away for optimal texture and freshness.