Double Decker Oreo Cheesecake

DOUBLE DECKER OREO CHEESECAKE

1 pkg. (17 oz.) Oreo cookies, divided
1/4 cup butter, melted
4 pkg. (8 oz. each) cream cheese, softened
1 cup sugar
1 tsp. vanilla
1 cup sour cream
4 eggs
4 squares semi-sweet chocolate, melted

Heat oven to 325 degrees. Process 30 cookies in food processor until finely ground. Add butter; mix well. Press onto bottom of 13x9-inch pan. Beat cream cheese, sugar and vanilla in large bowl with mixer until well blended. Add sour cream; mix well. Add eggs, 1 at a time, beating after each just until blended; pour half over crust. Stir melted chocolate into remaining batter; pour over batter in pan. Chop remaining cookies; sprinkle over batter. Bake 45 minutes or until center is almost set. Cool completely. Refrigerate 4 hours. Makes 16 servings.