Chocolate Chip Cheesecake

{Wendy's Recipe}

NOTE: this makes a large cheesecake - do not attempt to bake it
in a regular pie pan or in a pre-made crust...
You will need a 10" spring-form pan - borrow one if you have to, it's worth it!!

Preheat oven to 325.
Crust:
    2 cups crushed chocolate wafers (or Oreos w/ filling removed.  (About a 14 oz. pkg. Oreos)
    1/2 cup butter or margarine, melted
Mix together crumbs and melted butter until thoroughly combined.
Pat into the bottom of a spring-form pan.
Bake at 325 for 20 minutes.

Filling:
    2  8-oz. packages regular cream cheese, room temperature
    3/4 cup sugar
    1/2 cup sour cream
    1 tsp. vanilla
    4 eggs
    1 cup (6 oz) semi sweet chocolate chips
Beat cream cheese until fluffy.
Add sugar, 1/4 cup at a time, beating between each addition.
Continue to beat until smooth.
Add remaining ingredients and beat until creamy.
Pour into crust.
Bake 40 minutes or until just a 3' circle in the center jiggles.
Remove from oven and cool 20 minutes.
Turn oven to 425.

Sour Cream Topping:
    1 cup sour cream
    1/2 cup sugar
    1 1/2 tsp lemon juice
    1 1/2 tsp vanilla
Mix all ingredients together while cake cools.
At the end of cooling time, spoon topping gently over cheesecake.
Bake at 425 5 minutes ONLY.

Cool cheesecake completely.
Run a knife around the edge and then release from pan to serve.