Preheat: Set your oven to 325°F (165°C). Prepare a baking dish by placing four ramekins inside.
Mix Base: In a bowl, whisk the egg yolks and vanilla extract together until well blended.
Heat Cream: In a saucepan, combine the heavy whipping cream and 1 tablespoon of sweetener. Heat over medium, whisking continuously, until the mixture just starts to simmer.
Combine: Slowly pour the hot cream into the egg mixture, whisking constantly to temper the eggs and avoid curdling.
Divide: Pour the custard evenly into the ramekins. Place the baking dish on the oven rack and add hot water until it reaches halfway up the sides of the ramekins.
Bake: Bake on the middle rack for approximately 30 minutes, or until the custard is set but still slightly jiggly in the center.
Cool: Remove the ramekins from the baking dish and allow them to cool to room temperature before chilling in the fridge for at least 10 minutes.
Caramelize: Sprinkle 1 tablespoon of sweetener over each crème brûlée. Use a culinary torch to caramelize until golden and crisp.
Serve: Let the topping cool and harden before serving chilled for the perfect texture contrast.