Reduce the oven temperature to 300°F.
In the bowl of a stand mixer fitted with the paddle attachment, beat the cream cheese and sugar on low speed until completely combined and smooth.
24 ounces cream cheese, ½ cup granulated sugar
Add the heavy cream, sour cream, lemon juice, vanilla, and lemon zest and mix on low speed until well combined.
⅔ cup heavy cream, ⅓ cup sour cream, 2 tablespoons lemon juice, 1 teaspoon pure vanilla extract, 1 tablespoon grated lemon zest
Add the egg yolks, one at a time, mixing slowly to combine after each addition. Scrape down the sides of the bowl as needed to make sure everything is well combined.
5 egg yolks
Add the salt and cornstarch, mixing until well combined, then pour the cheesecake batter into the prebaked crust in the springform pan.
1 teaspoon kosher salt, 2 tablespoons cornstarch
Wrap the springform pan tightly in aluminum foil, then place it inside another larger pan. Fill the outside pan with enough warm water to go about halfway up the sides of the springform pan.
Place both pans in the oven and bake for 75 minutes. The center should be set, but still jiggly.
Turn off the oven and leave the door closed for 30 minutes. The cheesecake will continue to cook, but slowly begin to cool as well.
After 30 minutes, crack the door of the oven open for another 30 minutes to allow the cheesecake to continue to cool slowly. This process helps prevent cracking.
Remove the cheesecake from the oven and water bath wrapping and place the cheesecake on the counter to finish cooling.