Step 6
Working with a stand mixer, preferably fitted with the paddle attachment, or with a hand mixer in a large bowl, beat the cream cheese at medium speed until it is soft and creamy, about 4 minutes. With the mixer running, add the sugar and salt and continue to beat for another 4 minutes or so, until the cream cheese is light. Beat in the vanilla. Add the eggs, one by one, beating for 1 full minute after each addition — you want a well-aerated batter. Reduce the mixer speed to low and stir in the sour cream and/or heavy cream.