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 the shake and add extra sweetener if desired.
04 - Divide the shake evenly into two chilled glasses.
05 - Top with whipped cream, banana slices, and a sprinkle of cinnamon if desired. Serve immediately.