Gather your ingredients to save time.
Prepare the banana by breaking it into chunks, or use a frozen banana without thawing.
Add the soy milk, banana, peanut butter, cacao powder, and maple syrup to the blender. Include any optional ingredients now.
Blend on high until smooth. Add more soy milk if the mixture is too thick.
Taste the smoothie and adjust sweetness with more maple syrup if desired. Add ice cubes for a colder drink.
Pour the smoothie into a glass or mason jar and enjoy! Consider topping with sliced bananas or cacao nibs.