01 - Place bananas, milk, maple syrup or honey, vanilla extract, and ice cubes in a blender.
02 - Blend mixture on high speed until completely smooth and frothy, about 30 seconds.
03 - Taste shake and add extra sweetener if desired, blending again briefly to incorporate.
04 - Divide shake evenly into two chilled serving glasses.
05 - Top with whipped cream, banana slices, and a light sprinkle of cinnamon if preferred. Serve immediately.