Preheat Oven: Set oven to 325°F (160°C). Prepare a baking tray for the water bath.
Whisk Eggs & Sweetener: In a bowl, whisk the eggs, keto sweetener and salt until smooth.
Heat Cream: Place the heavy cream in a saucepan and heat it until hot to the touch but not boiling.
Combine Mixtures: Gradually whisk the warm cream into the egg mixture, stirring constantly to prevent the eggs from cooking.
Flavour It: Richen with vanilla extract.
Pour Into Ramekins: Divide the custard evenly among ramekins. Dust with nutmeg or cinnamon if desired.
Bake in Water Bath: Set ramekins to the baking pan, pour hot water to come halfway up the sides, bake for 30 minutes or until the custard is set but the center still jiggles.
Cool & Serve: Remove ramekins from the tray, cool to room temperature and chill if you like your custard cold.