Take the measuring cup and pour the butterscotch syrup into it. After that, add the softened butter to it.

Using a whisk, combine the two well until they are uniform.

Then, pour the cream soda into it and stir.

For the topping, take a large mixing bowl and add the heavy cream to it. Whisk the cream until it forms soft peaks.

Now, pour the butterbeer into the glass mugs. Using a spoon, add a dollop of whipped cream on top of both glasses. Your delicious butterbeer is ready!