In a double boiler, combine cocoa butter, shea butter, carrier oil, and beeswax. Heat gently, stirring occasionally, until fully melted.
Once melted, add the chocolate chips or grated chocolate. Stir until completely dissolved and smooth.
Remove the mixture from heat and let it cool slightly. Stir in vitamin E oil.
Once the mixture has cooled a little more (but is still liquid), add 1–2 drops of peppermint essential oil. Mix well.
Carefully pour the mixture into small tins or lip balm containers. Allow to cool and solidify completely (about 1–2 hours).
Seal the tins, label them if desired, and enjoy your mint chocolate lip balm whenever your lips need a treat.