01 - Add the frozen banana slices, milk, unsweetened cocoa powder, creamy peanut butter, maple syrup or honey, vanilla extract, and a pinch of salt to a blender.
02 - Blend on high speed until the mixture is completely smooth and creamy.
03 - Taste the mixture and add additional sweetener if desired, blending again to incorporate.
04 - Divide the smoothie evenly between two glasses.
05 - Top each serving with optional whipped cream, chocolate shavings, or crushed peanuts. Serve immediately.