Step 1

In a high-speed blender, combine the apple, banana, flax, peanut butter, cinnamon, and milk. Blend until smooth, stopping to scrape down the blender as needed. The apple should become liquified, which will add more "liquid" to the mix, but if you need to add extra liquid, you can start by adding 2 tablespoons at a time.

Step 2

Once the mixture is totally smooth, add in the ice and blend again until a slushy texture is achieved. Serve right away for the best texture and flavor.