By Madison Gillespie   In January, Starbucks introduced a new seasonal beverage that is quickly shaping up to become a favorite. The cinnamon shortbread latte – sometimes dubbed the “CSL” – comes hot, iced, or as a frappuccino, and it’s a blend of indulgent winter flavors. The typical espresso and steamed milk are combined with … More REVIEW: Starbucks’ Cinnamon Shortbread Latte