01 - Add the banana, milk, peanut butter, cocoa powder, and sweetener (if using) to a blender container.
02 - Add vanilla extract and ice cubes, if desired, for extra creaminess and chill.
03 - Blend on high speed until completely smooth and creamy, approximately 1-2 minutes.
04 - Taste the smoothie and adjust sweetness with additional honey or maple syrup if needed.
05 - Pour evenly into two glasses and serve right away for optimal texture and flavor.