Add all of the ingredients into the blender and cover with the lid. Blend until smooth and creamy. You may have to scrape the sides of the blender once, then blend again.
Pour into serving glasses and serve with a straw or a spoon.
Notes
Keep the frosty between 19 and 21 degrees Fahrenheit to achieve its true consistency.
Feel free to use your favorite non-dairy milk or low-fat versions of these ingredients.