Chocolate Chip Cheesecake
["1 1/2 c. graham cracker crumbs *", "1/3 c. Hershey's cocoa *", "1/3 c. sugar *", "1/3 c. butter, melted *", "3 pkg. (8 oz. each) cream cheese, softened", "1 (14 oz.) can sweetened condensed milk (not evaporated milk)", "3 eggs", "2 tsp. vanilla extract", "1 c. Hershey's mini chips (semi-sweet chocolate), divided", "1 tsp. all-purpose flour"]
["*Or 18 finely crushed Oreos."]
["graham cracker crumbs", "sugar", "butter", "cream cheese", "condensed milk", "eggs", "vanilla extract", "chips", "all-purpose flour"]