Combine graham cracker crumbs, 1/3 cup sugar (Splenda), cocoa and butter; press onto bottom of 9-inch springform pan.
Beat cream cheese and remaining 1/4 cup sugar (Splenda) until fluffy.
Gradually beat in sweetened condensed milk, then melted chips, until smooth.
Add eggs and vanilla;; beat well. Pour into prepared crust.
Bake 60-70 minutes or until center is almost set.
Remove from oven.
With knife, loosen cake from side of pan.
Remove side of pan.
Refrigerate until cold.
Garnish with chocolate drizzle.
Store, covered, in refrigerator.
Chocolate Drizzle: Melt 2 Tablespoons butter in small saucepan over low heat; add 2 tablespoons Hershey's cocoa and 2 tablespoons water.
cook and stir until slightly thickened. DO NOT BOIL.
Gradually add 1 cup powdered sugar and 1/2 teaspoon vanilla extract, beating with whisk until smooth. Makes about 3/4 cup.
**Tip: If desired, spoon drizzle over cake, or into small seal-top plastic bag. With scissors, make small diagonal cut in bottom corner of bag (careful if not cooled enough will run out all over your cake). Squeeze drizzle over top of cake.