01 - Add cooled coffee, banana, milk, honey or maple syrup, vanilla extract, ice cubes, and oats (if using) to blender container.
02 - Blend on high speed for 30-45 seconds until completely smooth and creamy, stopping to scrape down sides if necessary.
03 - Taste the smoothie and add additional sweetener if desired, blending briefly to incorporate.
04 - Pour evenly into two glasses and serve right away while cold and frothy.