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.