01 - Combine bananas, milk, maple syrup or honey, vanilla extract, and ice cubes in a blender.
02 - Blend at high speed until mixture is smooth and frothy, approximately 30 seconds.
03 - Taste and add additional sweetener if preferred.
04 - Divide shake evenly into two chilled glasses.
05 - Top with whipped cream, banana slices, and a dusting of cinnamon as desired. Serve immediately.