01 - In a medium mixing bowl, use a hand mixer to beat the softened cream cheese until smooth and creamy, ensuring no lumps remain.
02 - Add the powdered erythritol and vanilla extract to the bowl. Beat on medium speed until fully combined and the mixture appears uniform in texture.
03 - Gradually pour in the heavy whipping cream while the mixer continues running. Beat until the mixture transforms into a light, airy consistency that holds soft peaks when the beaters are lifted. Fold in lemon zest at this stage if using.
04 - Spoon or pipe the cheesecake fluff evenly into four individual serving glasses, ramekins, or small bowls, smoothing the tops with a spatula for presentation.
05 - Garnish each serving with fresh berries and chopped nuts if desired. Serve immediately for a fluffy texture, or refrigerate for up to 2 hours to achieve a firmer, more mousse-like consistency. Store covered in the refrigerator for up to 2 days.