Chocolate Cake with Surprise Filling

This is a black-bottom-style chocolate cake where dollops of sweetened cream cheese and chocolate chips get spooned over the top of the batter and bake right into hidden cheesecake pockets throughout the slice. No frosting required, the surprise inside is the whole show.

Buttermilk is the workhorse here. The acid reacts with baking soda for an even, tight crumb and keeps the cake soft for days. The directions even give you a buttermilk substitute, a teaspoon of vinegar in a cup of milk, for when you do not have it on hand.

The egg yolks beat into the cocoa-sugar base while the whites get whipped separately and folded in last. That extra step is what gives the cake its airy, almost souffle-like lift even with the heavy cream cheese dollops sinking in here and there.

Pro Tips

• Drop the filling in heaping teaspoons spaced evenly across the surface. Big globs sink straight to the bottom; small evenly placed scoops stay suspended at different depths for that hidden-pocket effect.
• Test for doneness by watching the edges. The cake is ready when it pulls away from the pan sides, not when a toothpick comes out clean. The cream cheese pockets stay tacky no matter how long you bake.
• Make sure the cream cheese is fully softened. Cold cream cheese leaves lumps that never blend with the egg and sugar, and you end up with chalky white spots.
• Cool completely in the pan before slicing. The cream cheese filling needs time to set, and a warm cake gives you a sloppy slice.

Variations

• Add a teaspoon of espresso powder to the cocoa for a deeper, mocha-leaning chocolate flavor without making the cake taste like coffee.
• Swap chocolate chips in the filling for white chocolate chips for a more contrasting two-tone surprise.
• Stir half a cup of toasted chopped pecans into the cream cheese filling for a German chocolate cake twist.