Combine all ingredients in a blender. Blend on medium to high speed until smooth and creamy, about 1 minute. Add more water as needed to promote blending.
Pour the smoothie into glasses, and enjoy!
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Notes
Use fresh fruit if you don't have frozen. Using a frozen banana, however, does make the smoothie creamier than using a fresh one.
If you want to make this up to 24 hours in advance, keep it in a sealed jar or container in the fridge.