01 - Place chopped apples, banana, Greek yogurt, milk, honey or maple syrup if using, ground cinnamon, vanilla extract, and ice cubes into a blender.
02 - Blend on high speed until smooth and creamy, about 1 to 2 minutes.
03 - Taste the smoothie and adjust sweetness or cinnamon to preference.
04 - Pour the smoothie into glasses and serve immediately.