PREHEAT oven to 325° F. Grease 9-inch springform pan.
COMBINE cookie crumbs and butter in medium bowl. Press onto bottom and 1 inch up side of prepared pan.
BEAT cream cheese and sweetened condensed milk in large mixer bowl until smooth. Beat in eggs, melted chocolate and vanilla extract. Stir in bite-size chocolates; pour into prepared crust.
BAKE for 55 to 65 minutes or until edges are set but center still moves slightly. Remove from oven; cool completely in pan on wire rack. Refrigerate for several hours or overnight. Remove side of pan; sprinkle with cocoa before serving.