01 - Place the bananas, Greek yogurt, milk, and optional sweetener into a blender container.
02 - Add the vanilla extract, cinnamon, seeds, and a handful of ice cubes if using.
03 - Blend on high speed until completely smooth and creamy, approximately 45-60 seconds.
04 - Taste the smoothie and adjust sweetness or thickness by adding more milk or honey as needed.
05 - Pour the smoothie evenly into two glasses and serve right away for the best texture and flavor.