- 1 (12 fluid ounce) can or bottle root beer, cold
- water, or as needed
- 1 1/4 cups skim milk
- 3 tablespoons sugar-free chocolate flavoring syrup (such as Torani®)
- 3 tablespoons sugar-free caramel flavoring syrup (such as Torani®)
- 2 tablespoons instant coffee (such as Folgers®)
- 1 tablespoon imitation vanilla extract
- 1 teaspoon artificial sweetener, or to taste
- Pour root beer into an ice cube tray, adding water to fill the tray as needed.
- Freeze until solid, 2 to 3 hours.
- Combine frozen root beer, milk, chocolate syrup, caramel syrup, instant coffee, vanilla extract, and sweetener in a blender; blend until smooth.