Even better with no corn allergies, add one ripe banana.
It will thicken the shake nicely. Corn is a frequent allergen.
And you can add chocolate chips, and I often add some cherries. Our family loves this. It's an old, old Weight Watcher's recipe.
It was so good that my then early teen son asked for it often, but asked me to not tell his buddies it was a WW recipe!!
Just plain old milk, ice cubes, banana, flavorings or fruit. Maybe a touch of sugar or Stevia. We like the crunchiness of chocolate chips in this.