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