Cream the cream cheese with an electric mixer. Add the heavy cream and peppermint extract. Add the powdered sweetener slowly, mixing well after each addition.
When it is thoroughly mixed in form 24 balls and press down into one-inch circles on a piece of parchment paper. Freeze for 15 minutes.
Melt the chocolate (and coconut oil, if using) in the microwave in 30-second increments, mixing well after each. When the chocolate is 80% melted stop heating it and stir until it is completely melted.
Use a fork to dip each peppermint patty into the chocolate. Place on a new sheet of wax paper. Repeat. Chill until the chocolate sets. Store in the refrigerator.