Microwave at HIGH (100%) 30 to 45 seconds or until melted. Stir in cocoa until smooth; set aside.
Beat cream cheese in large bowl.
Add cocoa mixture; beat well.
Gradually beat in sweetened condensed milk until smooth.
Add eggs and vanilla; beat well.
Pour batter into prepared pan.
Bake 1 hour and 5 minutes or until set. (Center will be soft.)
Remove pan from oven to wire rack; loosen cake from side of pan.
Cool completely; remove side of pan.
To serve, garnish as desired.
Cover; refrigerate leftover cheesecake.
Garnish as desired.
Notes / Tips / Wine Advice:
CHOCOLATE CRUMB CRUST:
Place 6 tablespoons butter or margarine in medium microwave-safe bowl. Microwave at HIGH (100%) 30 seconds or until melted. Stir in 1-1/2 cups vanilla wafer crumbs (about 45 wafers), 6 tablespoons powdered sugar and 6 tablespoons HERSHEY'S Cocoa; blend well. Press mixture onto bottom and 1/2 inch to 1-inch up side of 9-inch springform pan.