Mix graham cracker crumbs with melted butter until well combined.
Press the mixture firmly into the bottom of a lined 9×13-inch pan.
Chill in the refrigerator while preparing the cheesecake filling.
Step 2: Make the Cheesecake Filling
Beat cream cheese, sugar, and vanilla extract until smooth.
Add eggs one at a time, mixing well after each addition.
Stir in sour cream until fully incorporated.
Pour the cheesecake filling over the chilled crust.
Step 3: Bake the Cheesecake
Preheat oven to 325°F (163°C).
Bake for 45–50 minutes, or until the cheesecake is set but slightly jiggly in the center.
Cool completely at room temperature, then refrigerate for at least 4 hours (preferably overnight).
Step 4: Prepare the Crunch Topping
