How do I keep the swirl from sinking?
Two things help: make the cream mixture thick (room temp cream cheese plus powdered sugar does that), and do not over-swirl. Think loose figure eights, 6 to 8 passes max. Overdoing it turns the top muddy and the swirl can sink into the batter.
Can I make these without cream cheese?
Yes. Skip the swirl and add 1/2 cup chocolate chips to the batter, or dollop sweetened whipped ricotta (well drained) as a different creamy option. The bake time stays about the same, but start checking at 24 minutes.
Why use both cocoa powder and melted chocolate?
Cocoa brings that classic brownie punch and keeps the batter light. A small amount of melted chocolate adds roundness and helps with that glossy, crinkly top.
How do I know when they are done?
A toothpick in the brownie portion should come out with moist crumbs, not wet batter. The edges should look set and slightly pulled from the sides, and the center should look set (the swirl can have a tiny, gentle wiggle, but it should not look liquid).
Can I double this recipe?
Yes, bake in a 9x13-inch metal pan. Start checking around 30 minutes and expect 32 to 40 minutes depending on your oven and pan. Use the same doneness cues: toothpick in the brownie portion with moist crumbs, edges set, center not wet.
What if I use a 9x9-inch pan?
You will get slightly thinner brownies. Start checking 2 to 4 minutes earlier. Look for set edges and a toothpick in the brownie portion that comes out with moist crumbs.