Using an electric mixer, beat the cream cheese and butter on medium speed until combined and soft, about 2 minutes. Add the sugar continue to beat on medium speed, scraping the bowl once or twice, until the mixture is very light and fluffy, about 5 minutes. Add the eggs one at a time, beating until each one is completely incorporated before adding the next. Scrape down the sides of the bowl, reduce the speed to low, and gradually add the flour until it has all been combined. Add the vanilla extract and salt and mix on low speed until incorporated, about 1 minute.