In crafting a White Chocolate Mocha, Starbucks employs a blend of high-quality espresso, steamed milk, and white chocolate syrup. The espresso provides a robust coffee flavor, while the steamed milk adds a creamy texture. The key player here is the white chocolate syrup, contributing sweetness and a distinct flavor profile. Starbucks takes pride in using a proprietary blend, ensuring a consistent and delicious taste across their locations. Personally, I find the balance of the rich espresso, velvety steamed milk, and the sweetness from the white chocolate creates a delightful and indulgent beverage that appeals to a wide range of palates.