01 - Combine bananas, milk, maple syrup or honey, vanilla extract, and ice cubes in a blender.
02 - Blend the mixture on high speed until smooth and frothy, approximately 30 seconds.
03 - Taste the shake and adjust sweetness to preference if needed.
04 - Pour the shake into two chilled serving glasses.
05 - Top with whipped cream, banana slices, and a sprinkle of ground cinnamon if desired. Serve immediately.