01 - In a medium bowl, beat the cream cheese with a hand mixer until smooth and fluffy.
02 - Add the granulated sugar, lemon zest, lemon juice, and vanilla extract to the cream cheese. Beat until well combined and creamy.
03 - In a separate bowl, whip the heavy cream and powdered sugar together until stiff peaks form.
04 - Gently fold the whipped cream into the lemon cheesecake mixture, followed by the sour cream, until fully incorporated and light.
05 - Spoon the mousse into individual serving glasses or bowls.
06 - Cover and refrigerate for at least 2 hours to set.
07 - Before serving, garnish with extra lemon zest, fresh berries, and crushed graham crackers if desired.