01 - Place softened cream cheese in a medium mixing bowl. Using a hand mixer on medium speed, beat until completely smooth and creamy, approximately 2 minutes. Ensure no lumps remain.
02 - Add powdered erythritol and vanilla extract to the bowl. Continue beating on medium speed until the sweetener is fully dissolved and the mixture is uniform in texture.
03 - While the mixer runs on medium-low speed, gradually pour in the heavy whipping cream in a steady stream. Increase speed to medium-high and continue whipping until the mixture becomes light, airy, and holds soft peaks when the beaters are lifted. Fold in lemon zest if using.
04 - Divide the cheesecake fluff evenly among four serving glasses or dessert bowls, using approximately 1/2 cup per serving. Top with fresh berries and chopped nuts if desired. Serve immediately for the lightest texture or refrigerate for up to 48 hours for a firmer consistency.