My Recipe for Starbucks Skinny Peppermint Mocha. It’s a hot, minty, chocolate, coffee treat…Starbucks makes their dreamy, skinny holiday drink with espresso, steamed nonfat milk, sugar-free mocha sauce and sugar-free peppermint syrup. My home version is simple to make since I used strong brewed coffee, unsweetened cocoa, Splenda or Truvia and peppermint extract. Each skinny drink has 90 calories, 1 gram of fat and 3 Weight Watchers SmartPoints. 1. Brew coffee stronger than usual. In a small pot, add milk, cocoa, Splenda and peppermint extract.