Preheat oven to 300 degrees F. Prepare Chocolate Crumb Crust.
Chocolate Crumb Crust: In medium bowl, combine vanilla wafer crumbs (about 45 wafers), confectioners' sugar, cocoa powder and butter. Press firmly on bottom and 1/2 inch up side of 9-inch springform pan.
In large bowl, beat cream cheese until fluffy. Gradually beat in sweetened condensed milk until smooth.
Add remaining ingredients; mix well.
Pour into prepared pan.
Bake 1 hour and 5 minutes or until center is set.
Cool. Chill in refrigerator at least 4 hours.
To serve, drizzle with additional melted chocolate if desired. Store leftovers covered in refrigerator.