Chocolate Chip Cheesecake

1 1/2 cups graham cracker crumbs
1/3 cup Hershey's Cocoa
1/3 cup sugar
1/3 cup melted butter
3 packages (8 oz. each) cream cheese, softened
1 can sweetend condensed milk
3 eggs
2 tsp. vanilla extract
1 cup Hershey's mini chips semi-sweet chocolate, divided
1 tsp. flour

Heat oven to 300 degrees.  In bowl, combine graham cracker crumbs, cocoa, sugar, and butter.  Press evenly on bottom of 9 inch springform pan.  In large mixing bowl, beat cream cheese until fluffy.
Gradually add sweetened condensed milk, beating until smooth.  Add eggs and vanilla, mix well.  In small bowl, toss 1/2 cup mini chips with flour to coat.  Stir into cheese mixture.  Pour into prepared pan.  Sprinkle remaining chips evenly over top.  Bake 1 hour.  Turn off oven, allow to cool in oven 1 hour.  Remove from oven, cool to room temperature.  Refrigerate.