Adjust oven temperature to 400°F.
In the bowl of a stand mixer fitted with the paddle attachment, combine the cream cheese and sugar and mix together on medium speed until smooth.
24 ounces cream cheese, ⅔ cup granulated sugar
Add in the heavy cream, sour cream, salt, and vanilla bean paste and mix to combine.
⅔ cup heavy whipping cream, ½ cup sour cream, 1 teaspoon kosher salt, ¾ teaspoon vanilla bean paste
Add in the eggs and mix for 30 seconds, then add in the cornstarch and mix until just incorporated.
5 large eggs, 2 tablespoons cornstarch
Gently fold in the sprinkles. Overmixing the sprinkles will cause the batter to turn black.
¼ cup sprinkles
Cover the outside of the springform pan with aluminum foil to prevent water from seeping in.
Pour the cheesecake batter on top of the prebaked crust. Place the springform pan into a large baking dish or broiler pan and fill with 1 inch of water.
Place both pans into the preheated oven on the center rack and bake for 15 minutes.
Reduce the heat to 250°F and continue baking for an additional hour.
Turn the oven off and leave the cheesecake inside for 30 minutes.
Open the oven door and leave the cheesecake inside for another 30 minutes to finish setting up.
Once the cooldown time is up, remove the cheesecake from the oven and place it onto a wire cooling rack to let it cool completely.
Once the cheesecake has completely cooled, cover it with plastic wrap, then place it into the refrigerator to chill for 8 hours.