To a large bowl using the hand mixer with whisk attachments, beat the cream cheese, allulose, and ¼ cup of the heavy whipping cream until smooth and fluffy.
In a separate bowl, using an electric hand mixer on high speed, whip the remaining cream and vanilla extract to a whipped cream consistency.
Using a rubber spatula, fold the whipped cream into the cream cheese mixture until well combined. Add chopped berries if desired.