Peel the ripe banana and place it in the blender.
Cut the pineapple into small pieces and add it to the blender.
Add the ground flaxseed to the blender.
Pour the coconut milk into the blender.
If desired, add a scoop of protein powder to the blender.
Put the lid on the blender and blend everything together until smooth and creamy.
Pour the smoothie into a glass and enjoy!