- Heat the oven to 325°F (165°C). Wrap the outside of a 9-inch springform pan in two layers of heavy-duty foil.
- Mix the crust ingredients, press firmly into the bottom of the pan and bake 10 minutes. Let cool.
- Beat the cream cheese on low speed until smooth, scraping the bowl often. Beat in the sugar, flour and salt.
- Mix in the sour cream, vanilla and lemon zest. Add the eggs one at a time on low speed, just until combined.
- Pour the filling over the crust. Set the pan in a roasting pan and pour in hot water to come halfway up the sides.
- Bake until the edges are set and the center still jiggles slightly, 60 to 70 minutes.
- Turn off the oven, prop the door open a crack and leave the cheesecake inside for 1 hour.
- Run a knife around the edge, cool to room temperature, then refrigerate at least 8 hours or overnight.