Preheat the oven to 325 degrees F and allow the cream cheese to come to full room temperature until soft and spreadable.
Beat together the cream cheese, vanilla, salt, cornstarch, sugar, and sour cream until the mixture is glossy and free of lumps, scraping the bottom of the bowl as needed.
Mix in the eggs one at a time, stopping immediately once each egg is incorporated to avoid whipping excess air into the batter.
Wrap the exterior bottom of a springform pan tightly with foil and line the interior with parchment paper to prevent leaks.
Pour the batter into the prepared pan, smooth the top, and tap it on the counter to release any trapped air bubbles.
Place the springform pan on a rimmed baking sheet and fill the sheet with water until it reaches halfway up the sides of the pan.
Bake for 35-45 minutes until the edges are set and the center has a slight, gel-like jiggle.
Cool the cheesecake on the counter before transferring it to the refrigerator to chill until completely firm and cold.