If you spend any time at The Wizarding World of Harry Potter, you'll encounter Harry's favorite drink: butterbeer. It has become such a hit, the park now serves it three ways (warm, cold and frozen). And it's the real deal: According to one park spokesperson, the stars of the Harry Potter films, including Daniel Radcliffe and Emma Watson, said the drink was just as they had imagined it.
Combine the brown sugar with 1/2 cup water in a small saucepan over medium-high heat. Cook, stirring occasionally, until the mixture boils and the sugar dissolves, 2 to 3 minutes. Transfer to a small bowl or liquid measuring cup and refrigerate until very cold, about 1 hour.
Beat the heavy cream and confectioners' sugar in a large bowl with a mixer on medium-high speed until soft peaks form. Beat in the butterscotch sauce and salt until medium peaks form. Cover and refrigerate until ready to use.
Stir the butter extract and vanilla extract into the cold brown sugar syrup. For each drink, combine 1 cup seltzer with 3 to 4 tablespoons of the brown sugar syrup in a chilled glass. Top with the butterscotch whipped cream.