01 - Add bananas, milk, maple syrup or honey, vanilla extract, and ice cubes to the blender.
02 - Blend on high speed until the mixture is smooth and frothy, approximately 30 seconds.
03 - Sample and add more sweetener if necessary, blending briefly to incorporate.
04 - Pour the shake into two chilled serving glasses.
05 - Top with whipped cream, banana slices, and a sprinkle of cinnamon, if desired. Serve immediately.