Add all ingredients to a blender and mix until smooth, stopping to scrape down the sides of the container if needed.
Notes
If using a frozen banana, only use about five ice cubes, or you'll end up with sorbet instead of a smoothie.If you don't have espresso grounds or espresso beans, you can substitute espresso powder or instant espresso coffee grounds. You also can try using regular ground coffee.Consider adding protein powder for extra nutrition.