1. Preheat oven to 300 degrees.
2. Spray bottom of 9-inch springform pan with cooking spray.
3. Combine crumbs and sugar; sprinkle evenly over bottom of pan.
4. In mixer bowl, beat cheese until fluffy. Mix in cocoa and flour. Add sweetened condensed milk, egg whites, egg, chips and vanilla; mix well.
5. Pour into prepared pan.
6. Bake 45-50 minutes or until center is set.
7. Cool. Chill. Garnish as desired. Refrigerate leftovers.