7 cups diet cream soda
1 cup Torani sugar-free English Toffee syrup
Carefully mix together just before serving, adding the syrup to the soda then stirring gently to mix well, or the fizz will dissipate too soon.
Torani sells full sugar & sugar-free versions of English Toffee syrup. I have found Torani syrups at Beverages & More as well as Cost Plus.
Adapted from Britta's original butterbeer recipe: Britta.com