Nov 21, 2010. Review: Starbucks - Peppermint White Chocolate Mocha. Starbucks' Peppermint White Chocolate Mocha is more dessert than drink and is made of espresso and steamed milk flavored with white chocolate and peppermint flavored syrups and then topped with whipped cream and dark chocolate shavings. The cost of admission is $3.75 for a Tall, $4.45 for a Grande, and $4.75 for a Venti.