Aunt Karen's Chocolate Chip Cheesecake

My next few entries are going to be recipes from my family. We've enjoyed them at our gatherings and hope they'll will be family favorites of yours.

1 3/4 cups Oreo cookie crumbs
1/3 cup of butter, melted
1 1/4 cup sugar
3 (8 oz.) pkgs. of cream cheese, softened
2 tsp. vanilla extract
3 eggs
1 cup sour cream
1/4 cup chocolate chips
1/2 tsp. flour

In a bowl combine Oreo crumbs, butter and only 1/4 cup of the sugar. Press the mixture into the bottom and 2 1/2 inches up the sides of an 8 inch springform pan. Set aside. In a mixing bowl combine cream cheese, remaining sugar and vanilla. Beat on high speed until creamy. Beat in 1 egg at a time. Blend in sour cream. Mix chips with 1/2 tsp. of flour and blend into mixture with a spoon. Spread into prepared pan. Bake at 350 for 60 to 70 minutes or until center is set. Turn off oven, leave cake in and crack oven door. Let it rest in the oven for 1 hour. Remove from oven and cool completely. Chill for four hours or overnight. Remove from pan and top with chocolate shavings before serving.