Chop the chocolate into small, even pieces.
Place the chopped chocolate and oil in a microwave-safe bowl. Microwave in short 20-30 second bursts, stirring between each burst until the chocolate is fully melted. Be cautious not to overheat the chocolate.
Pour the melted chocolate into the molds, and if you want to add nuts, dried fruits, etc... Allow the chocolate to cool and set. You can speed up the process by placing it in the freezer for about an hour.
Once the chocolate has completely hardened, remove it from the molds and enjoy.