Preheat the oven to 325°F. Mix graham cracker crumbs and melted butter until combined. Press the mixture firmly into the bottom of a 9-inch springform pan. Bake for 10 minutes, then cool.
In a large bowl, beat the cream cheese and sugar until smooth. Add sour cream, key lime juice, zest, cornstarch, and vanilla extract. Mix just until combined.
Add eggs one at a time, mixing on low speed. Do not overmix.
Pour the filling over the cooled crust. Place the springform pan in a larger pan and pour hot water around it to create a water bath.
Bake for 50 to 60 minutes, until the edges are set and the center slightly jiggles.
Turn off the oven, crack the door, and let it cool for 1 hour. Refrigerate for at least 4 hours or overnight.
Garnish with whipped cream, lime slices, or extra zest before serving.
Notes
Notes
Store in the fridge for up to 5 days.
To freeze, wrap slices tightly in plastic wrap and foil, then place in an airtight container for up to 2 months.