In bowl of standing mixer fitted with whisk attachment, whisk cream cheese, confectioners sugar, and salt at medium-high speed until light and fluffy, 1 to 2 minutes, scraping down bowl with rubber spatula as needed. Add vanilla and beat at medium speed until combined, about 30 seconds; scrape down bowl. With machine running at low speed, add heavy cream in slow steady stream; when almost fully combined, increase speed to medium-high and beat until mixture holds soft peaks when whisk is lifted, another 1 to 2 minutes, scraping down bowl as needed.

Makes about 2 cups