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To get the right consistency for the frosting, it’s important to chill your tools. Place a large bowl and the beaters from your handheld electric mixer in the freezer and allow them to chill for about 15 minutes.  If you’re using a stand mixer, place the wire whisk attachment in the freezer with the bowl to chill. If you’re mixing the frosting by hand, place a wire whisk in the freezer to chill with the bowl. When the cream cheese mixture is fully blended, gradually add 2 cups (473 ml) of heavy whipping cream to the bowl. Beat the mixture on medium until firm peaks form. Make sure that the cream is extremely cold when you add it to the butter mixture.

Summary:
Chill a bowl and beaters in the freezer. Mix in the cream until stiff peaks form.