01 - Place bananas, milk, maple syrup or honey, vanilla extract, and ice cubes into a blender.
02 - Blend on high speed until smooth and frothy, about 30 seconds.
03 - Taste and, if desired, add additional sweetener to your preference.
04 - Pour the shake into two chilled glasses.
05 - Top with whipped cream, banana slices, and a sprinkle of cinnamon if desired. Serve immediately.