In a large bowl, blend the cream cheese, sugars, cocoa and flour with an electric mixer until combined (Use low speed to keep less air from getting into the batter, which can cause cracks). Scrape down the sides of the bowl.
Place springform pan inside another pan. Fill outside pan with enough warm water to go about halfway up the sides of the springform pan. The water should not go above the top edge of the aluminum foil on the springform pan.
Glaze and Topping