I love Maida Heatter's cookbooks. She is hilarious, and she has the best brownie recipes :) My favorite are the Santa Fe brownies, a brownie with a cream cheese swirl. They're kind of like black bottom cupcakes, only denser and no chocolate chips. They make a traditional 9x13 pan, but they're so tall I can only eat a couple at a time (ha!).
Like I mentioned in the marshmallow post, I don't have the best luck with swirling. And sometimes the top chocolate layer sinks through the cheesecake and other times it floats. In any case, these are very forgiving (even if they're not so pretty)!
I'm not able to find the recipe online anywhere, it's from Maida Heatter's Best Dessert Book Ever. And because I still don't understand copyright and recipes, and because you can get the book for less than $5, I'm not posting it. Instead, here's another readily available recipe of Heatter's that I'm anxious to try: polka-dot cheesecake - so fun!