Starbucks Secret Menu: Butterbeer Frappuccino Ask for a creme frappuccino base. Whole milk is required for the right consistency. Add in 3 pumps of caramel syrup, 3 pumps of toffee nut syrup and caramel drizzle. This recipe is for a grande, so adjust based on size or if you prefer a beverage that’s lighter on the sweetness. Definitely a must try for any Harry Potter fan!