Preheat oven to 350°F (175°C).

In a mixing bowl, combine sugar cookie dough and melted butter.

Press the mixture into the bottom of the springform pan.

Bake for 10 minutes or until lightly golden.

In a large bowl, beat cream cheese until smooth.

Add sugar and vanilla; mix until combined.

Add eggs one at a time, mixing well after each addition.

Stir in sour cream until smooth.

Pour filling over the crust.

Bake for 50-60 minutes or until the center is set.

Turn off the oven and let the cheesecake cool inside with the door ajar for 30 minutes.

Refrigerate for at least 4 hours before serving.