Heat oven to 300. In bowl combine graham cracker crumbs, cocoa, sugar and butter. Press evenly on bottom of 9" springform pan. In large mixer 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 chocolate chips with flour to coat; stir into cheese mixture. Pour into prepared pan. Sprinkle with remaining chips evenly over top. Bake 1 hour. Turn off oven, allow to cool in oven 1 hour. Remove from oven and cool to room temperature. Refrigerate.
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