01 - Place the banana, milk, peanut butter, cocoa powder, honey or maple syrup, vanilla extract, and ice cubes in a blender container.
02 - Blend on high speed until completely smooth and creamy, approximately 30-60 seconds. Scrape down sides if needed.
03 - Taste the smoothie and add additional sweetener if desired. Blend briefly to incorporate.
04 - Pour evenly into two glasses and serve right away while cold. Optionally garnish with peanut butter drizzle or cocoa nibs.