01 - Place frozen banana slices, milk, unsweetened cocoa powder, creamy peanut butter, maple syrup or honey, vanilla extract, and a pinch of salt into a blender.
02 - Blend the mixture on high speed until completely smooth and creamy.
03 - Taste and add more maple syrup or honey if a sweeter flavor is desired; blend again if needed.
04 - Pour the smoothie evenly into two glasses.
05 - Top each serving with optional whipped cream, chocolate shavings, or crushed peanuts as desired. Serve immediately.