For an extra layer of flavor, consider adding a pinch of cinnamon or nutmeg to the banana milk mixture. Adjust the amount of sweetener to your preference. You can also substitute other sweeteners like maple syrup or agave. If you don't have an immersion blender or hand mixer, you can vigorously whisk the coffee mixture by hand, though it will take longer to achieve the desired foam consistency. Feel free to experiment with different plant-based milk options, such as almond milk or oat milk, for a unique twist.