A Philly Fluff Cake, despite the name, is dense, moist, and tender, with rich swirls of bittersweet chocolate and a well-browned, sugary crisp exterior. It is more similar to a pound cake than a fluffy cake, and a generous portion of cream cheese in the batter lends the cake a gentle tang, and perhaps offers a clue to half of its name. A mixture of canola oil and butter stand in for traditional shortening, still giving the cake a pleasant moisture while adding delicious buttery flavor.
There seems to be a step missing between numbers 4 and 5. There are no instructions on how to add the batter to the pan and create the swirl. It goes straight from making the batter to putting it on the oven.