01 - Place bananas, milk, maple syrup or honey, vanilla extract, and ice cubes in a blender.
02 - Blend on high speed until mixture is completely smooth and frothy, about 30 seconds.
03 - Taste and adjust sweetness as desired, adding more syrup or honey if needed.
04 - Pour the shake into two chilled serving glasses.
05 - Top with whipped cream, banana slices, and sprinkled cinnamon if desired. Serve immediately.