To a nonstick pan over medium heat, add butter until melted. Add in vanilla extract and sweetener and stir to combine. The mixture may become clumpy, that is totally fine.
Add in raw nuts and stir until well-coated.
After a few minutes of stirring, the sweetener should become liquid. Continue stirring for a few minutes, until the liquid begins to caramelize.
Pour mixture onto parchment paper and allow it to cool for several minutes before consuming. Break apart, and enjoy!