There are two returning flavors: Thin Mints and Coconut Caramel. Thin Mint feature a combination of cool mint and chocolate, while Coconut Caramel delivers notes of toasted coconut and creamy caramel.
You can get either flavor added to Dunkin's hot and iced espresso, hot and iced coffee, Cold Brew, frozen coffee, and frozen chocolate through the beginning of spring 2020 at participating Dunkin' locations nationwide.
Photo via Dunkin'.