Add all ingredients to the canister of a blender.
Blend until it reaches your desired consistency and add more milk to thin out the smoothie, if needed.
Taste and add more honey/maple syrup to sweeten, if desired.
Any kind of apple can be used for this smoothie. I prefer a sweeter kind, such as honey crisp, but if you have more tart/less sweet apples, you can add more honey/maple syrup to sweeten.