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Close top view of spiderweb brownies on white round cake plate.
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Spooky Spiderweb Brownies

Spooky Spiderweb Brownies are a festive Halloween treat made of chocolatey & fudgy brownies, a velvety chocolate ganache and decorated with a vanilla buttercream. A decadent dessert for a festive and fun Halloween! 
Course: Dessert
Cuisine: American
Keyword: Spiderweb Brownies
Prep Time: 10 minutes
Cook Time: 35 minutes
Cooling and Decorating: 45 minutes
Servings: 12
Author: Heather



Buttercream Frosting


  • Preheat oven to 350°F. Line a 9 inch cake pan with parchment paper and spray with non stick spray.
  • Whisk together the melted butter and cocoa powder until smooth.
  • Add in the sugar and whisk to combine.
  • Whisk in vanilla extract and eggs until batter is smooth.
  • Stir in the flour until just fully incorporated.
  • Fold in semi-sweet chocolate chips.
  • Spread the batter into prepared cake pan and bake for 30-35 minutes until the edges are just starting to pull away from the cake pan.
  • Cool brownies completely before removing and decorating.
  • Once cooled, invert the brownies on a plate or cake stand. Do not flip them back over, decorate the bottom side. It is smooth and level.


  • Heat the heavy cream in the microwave for 45 seconds. Be careful not to boil or scorch the cream.
  • Pour cream over dark chocolate chips and let sit 2-3 minutes. Then whisk until smooth and thick.
  • Pour the ganache over the brownies and spread out evenly. Let some run down the sides for a little more spooky affect.
  • Let the ganache set for 15 minutes.

Buttercream Frosting

  • While the ganache sets, make the frosting. Stir together the softened butter, vanilla and powdered sugar until a frosting is formed.
  • Scoop the frosting into a zip top bag or piping bag.
  • Snip the corner of the bag with the frosting, then pipe starting in the center of the brownies a spiral in a circular motion until you have reached the outer edges.
  • Starting from the center, take a toothpick and drag it to the edge of the brownies. Do this to make 12 triangles creating a spiderweb.
  • Let brownies set at least 15 minutes before slicing and serving.


Serving: 1triangle slice | Calories: 507kcal | Carbohydrates: 59g | Protein: 5g | Fat: 29g | Saturated Fat: 19g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 7g | Trans Fat: 1g | Cholesterol: 99mg | Sodium: 166mg | Potassium: 237mg | Fiber: 3g | Sugar: 44g | Vitamin A: 662IU | Vitamin C: 1mg | Calcium: 75mg | Iron: 2mg
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