Place butterscotch and vegan butter into a 16 oz glass. Microwave on high for 1 to 1½ minutes, or until syrup is bubbly and vegan butter is completely mixed in.
Stir for 30 seconds and allow to cool. Slowly mix in club soda. Be careful. The mixture will fizz quite a bit.
Serve in two mugs or glasses. Think of magical Hogwart's and enjoy!