In a saucepan over medium heat, combine the heavy whipping cream, butter, and sugar substitute.

Bring to a boil and cook until well thickened.

Remove from the heat, then stir in the vanilla and peppermint extracts.

Pour the mixture into a well-greased loaf pan.

Chill until the mixture is soft set, then sprinkle on the peppermint candy.

Let chill until well set, and then slice to serve.