Although the ingredient list has changed over the years, Starbuck's PSL contains a mixture of milk, pumpkin spice sauce (made from sugar, condensed milk, pumpkin puree, flavors, and other ingredients), espresso, whipped cream, vanilla syrup, and pumpkin spice topping. Unlike homemade recipes, the Starbucks version contains different colors, natural flavors, stabilizers, and preservatives to ensure a consistent, stable product at all their stores. Make this copycat recipe to enjoy the real thing in your own kitchen without the long lines or additives.