01 - Place banana, apple, almond milk, maple syrup, cinnamon, nutmeg, vanilla extract, Greek yogurt (if using), and ice cubes into a blender.
02 - Blend on high speed until the mixture is completely smooth and creamy, approximately 30 to 60 seconds.
03 - Taste the mixture and adjust sweetness or spices as preferred.
04 - Pour into serving glasses and enjoy immediately.