01 - Place frozen banana slices, milk, cocoa powder, peanut butter, desired sweetener, vanilla extract, and salt in a blender.
02 - Blend on high speed until the mixture is completely smooth and creamy.
03 - Taste the smoothie and add additional maple syrup or honey if a sweeter flavor is preferred. Blend again briefly 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.