01 - Place banana, milk, cocoa powder, peanut butter, honey or maple syrup, vanilla extract, and ice cubes into a blender.
02 - Blend on high speed until completely smooth and creamy, approximately 30 to 60 seconds.
03 - Taste mixture and add additional sweetener if desired, then blend briefly to incorporate.
04 - Divide smoothie evenly between two glasses and serve immediately.