Set up a double boiler over medium-high heat. Add the chocolate and cream to the bowl and heat, stirring, until the chocolate is melted and a smooth ganache is formed; scrape down the sides of the bowl as the chocolate melts. Allow the ganache to cool for 5 minutes.
Place the cheesecakes on a serving platter. Pour a heaping tablespoon of ganache on top of each cheesecake. The ganache should be thick enough that it barely runs over the edges. Top each cheesecake with 3 raspberries and a mint leaf.