Combine cream cheese, Splenda, and vanilla extract in a bowl and mix well.
Beat the heavy cream in a separate bowl until it forms soft peaks.
Fold the whipped cream into the cream cheese mixture.
Transfer the mixture to a large glass bowl and chill with plastic wrap, for at least 25 minutes. Top with berries if desired. Serve immediately or store, covered with plastic wrap, in the refrigerator for up to 2 days.