We spoke to an expert baker about her thoughts on the ultimate chocolate cake topping, and she came up with the perfect ...

Bake until the center of the cake rises, forming deep fissures on the surface, and a toothpick inserted at the center comes out with a few crumbs attached, 55 to 60 minutes.

Any type of bittersweet chocolate will work, but for best results use one that’s tasty enough to eat out of hand and contains about 70% cocoa solids. Don’t use natural cocoa.

Cookies with mix-ins, such as chocolate chips, M&Ms, and chocolate chunks should be avoided as well because they don't soften enough to slice easily. Read more: 30 Types Of Cake, Explained ...

Any type of bittersweet chocolate will work, but for best results use one that’s tasty enough to eat out of hand and contains about 70% cocoa solids. Don’t use natural cocoa.

Bake until the center of the cake rises, forming deep fissures on the surface, and a toothpick inserted at the center comes out with a few crumbs attached, 55 to 60 minutes.