Mix graham cracker crumbs, sugar, and melted butter until it resembles wet sand.
Press firmly into the bottom of a springform pan.
Bake for 10 minutes at 325°F (160°C), then let it cool.
Beat the cream cheese and sugar together until smooth and creamy.
Add the eggs, one at a time, mixing on low speed.
Stir in sour cream, vanilla extract, and flour.
Mix until just combined to avoid overbeating.
Pour the filling into the cooled crust.
Place the springform pan into a larger roasting pan.
Add hot water to the roasting pan to create a water bath, which prevents cracks.
Bake at 325°F (160°C) for 50–55 minutes. The edges should be set, and the center should have a slight jiggle.
Turn off the oven, leave the door slightly open, and let the cheesecake rest for 1 hour.
Transfer to the refrigerator and chill overnight, at least 8 hours, before slicing.