In a large pot set over medium heat, add the cream, sugar, sorbitol, inverted sugar, dextrose, peppermint and vanilla seeds, and cook until a candy thermometer inserted in the pot reads 113 degrees F. Cool the mixture to 95 degrees F.
In a separate pot, heat the butter, dark chocolate and milk chocolate to melt, then cool the chocolate to 86 degrees F. Using an electric hand mixer, blend the chocolate with a little of the cream mixture. Slowly mix in the remaining cream mixture. Cool to 82 degrees F, then pipe into the bonbon molds and refrigerate until set, about 1 hour 30 minutes.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.