In a small pot, heat your butter, 3 tablespoon heavy cream, vanilla extract, and swerve, over medium-low heat until thickened and golden. About 10 minutes. Stirring constantly, this can burn quickly.
Remove pot from the heat and add the remaining 1 tbsp of heavy cream. Stir until smooth. Stir in your peanuts. Pour onto the parchment-lined tray and refrigerate until set. Once set, break and enjoy!