The secret behind this devilish cake is instant coffee powder, which enhances the rich chocolate flavor. Eat a bewitching slice of this cake by the light of the moon, and save the caramel spiderweb and licorice spider for last.

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Ingredients

Ingredient Checklist

Directions

Instructions Checklist
  • Preheat oven to 350 degrees. Butter a 12-by-17-inch rimmed baking sheet, and line with parchment paper. Butter lining. Dust bottom and sides with flour; tap out excess.

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  • Whisk together flour, baking soda, and salt in a medium bowl; set aside. Whisk together chocolate, coffee, and boiling water in a separate bowl; set aside.

  • Put butter and sugar in the bowl of an electric mixer fitted with the paddle attachment; beat on medium-high speed until pale and fluffy. Add sour cream; beat until smooth. Beat in eggs, one at a time, scraping down sides of bowl. Reduce speed to low; beat in flour mixture.

  • Whisk chocolate mixture again; add to batter. Beat until smooth.

  • Pour batter into prepared sheet. Bake until a cake tester inserted into center comes out clean, 20 to 25 minutes. Let cool completely in sheet on a wire rack.

  • Invert cake onto a rimless baking sheet; peel off parchment. Halve widthwise. Spread half of buttercream on top of one layer. Top frosted layer with second cake layer; coat cake with remaining frosting. Refrigerate 1 hour. Cut into 12 squares; garnish each serving with a caramelized cobweb.

Reviews (10)

60 Ratings
  • 5 star values: 9
  • 4 star values: 10
  • 3 star values: 15
  • 2 star values: 21
  • 1 star values: 5
Rating: Unrated
07/31/2013
I agree about the round pans but if you make it in 6 inch square it is easier!
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
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Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
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Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164
Rating: Unrated
10/09/2012
This cake was good, but it was really hard to handle in this shape. I would make it in round cake pans next time. The frosting was a lot of work and was probably not worth it. You can see my results here: http://puttingitallonthetable.com/?p=8164