In a microwave-safe bowl, combine peanut butter, butter, and Swerve.
Heat in 30 second increments, stirring frequently, until the mixture has melted. Stir well until all the Swerve if properly melted.
Pour into a 24-cavity truffle mold or into the prepared baking pan. Place in the freezer for 2-4 hours until the truffles are set. At this point you can unmold the truffles, place them in a plastic bag and store in the freezer until you're ready to eat them.
If using a baking pan, cut into 24 squares and store the squares in the freezer until you are ready to eat them.
