These brownies got rave reviews from my DH, son, DIL and of course me! The cheesecake layer was flavored with espresso, then you swirled a reserved amount of brownie batter on top. Several had commented that the brownie batter was a little stiff to swirl, so I added about one tablespoon of milk to loosen up the batter and it made swirling a breeze, love those comments! Dorie indicated the brownies would be done when the cheesecake layer was beige in color, LOL; it started out beige with the espresso in it. I went for the slightly brown edges and it was just fine. The espresso was not overwhelming, just the right amount of flavor and the texture was perfect, would definitely make again. I think you could add any flavor to the cheesecake, I'm thinking of adding hazelnuts to the brownie batter and flavoring the cheesecake with hazelnut liquor, yummy!