This is a cross between a brownie and a chocolate bar, a decadent rich chocolate cake with an amazing texture. This is the ultimate after dinner dessert sprinkled with powdered sugar, drizzled with a chocolate glaze or topped off with a dollup of whipped cream. It can also be made in a 9-inch cake pan instead of a springform pan. This can be made a day ahead but is better served the same day it is made, if you prepare a day ahead, cover and leave at room temperature. You will love this decadent chocolate cake!