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Three slices of Butterfinger cake with rum buttermilk frosting and crushed Butterfinger topping on separate plates.

Rum Buttermilk Butterfinger Cake


  • Author: Keith Recker
  • Total Time: 3 hr 45 min
  • Yield: 16 slices 1x

Description

A tender two-layer buttermilk cake soaked with spiced rum, frosted with rum buttermilk buttercream and topped with crushed Butterfingers. A grown-up home for Halloween candy.


Ingredients

Scale

For the cake:

  • 3/4 cup (1 1/2 sticks) unsalted butter, at room temperature
  • 1 1/2 cups granulated sugar
  • 3 large eggs, at room temperature
  • 1 1/2 tsp almond extract
  • 1/2 tsp vanilla extract
  • 1 cup buttermilk, at room temperature
  • 2 1/2 cups King Arthur unbleached all-purpose flour
  • 2 1/2 tsp baking powder
  • 1/2 tsp salt
  • 1/4 tsp ground nutmeg
  • 1/3 cup spiced rum, for soaking after baking
  • 6 mini Butterfinger bars, crushed, for garnish

For the frosting:

  • 2 cups (4 sticks) unsalted butter, at room temperature
  • 8 cups powdered sugar
  • 2 tsp vanilla extract
  • 1/4 cup spiced rum
  • Up to 4 tbsp buttermilk, at room temperature


Instructions

For the cake:

  1. Bring to room temperature. Let the butter, eggs and buttermilk come to room temperature, about 1 hour.
  2. Prep the pans. Preheat the oven to 350°F. Grease and flour two 9-inch round cake pans and, if you like, line the bottoms with parchment paper.
  3. Cream the butter and sugar. In a stand mixer fitted with the paddle attachment, cream the butter and sugar until light and lofty, 3 to 4 minutes.
  4. Add the eggs. With the mixer running, add the eggs one at a time, beating well after each.
  5. Add the wet ingredients. Add the almond extract, vanilla extract and buttermilk and beat until smooth.
  6. Add the dry ingredients. Add the flour, baking powder, salt and nutmeg and mix until just smooth, scraping down the sides of the bowl so everything is combined.
  7. Bake. Divide the batter evenly between the pans. Bake for about 30 minutes, until a wooden skewer inserted in the center comes out clean.
  8. Cool. Let the layers cool completely before removing them from the pans.
  9. Soak with rum. Pour the 1/3 cup rum evenly over the tops of the two layers.

For the frosting:

  1. Whip the butter and sugar. Using the whisk attachment, whip the butter and powdered sugar until completely combined.
  2. Add the rum and vanilla. Add the rum and vanilla extract and mix well.
  3. Adjust with buttermilk. Add the buttermilk gradually, just until the frosting is smooth and spreadable. You may not need all 4 tablespoons.
  4. Make ahead if you like. The frosting can be refrigerated for up to 3 days. Allow an hour or two for it to return to room temperature before using.

To assemble:

  1. Anchor the first layer. Place a small dab of frosting on a cake plate and set the first layer on top.
  2. Fill. Spread a layer of frosting over the top, then set the second layer on top.
  3. Crumb coat. Frost the entire cake with a thin layer of frosting and refrigerate, uncovered, for 15 minutes.
  4. Finish. Spread on the remaining frosting and sprinkle the crushed Butterfingers over the top.
  5. Serve. If the cake has been refrigerated, let it come close to room temperature before serving.
  • Prep Time: 45 min
  • Additional Time: 2 hr 30 min
  • Cook Time: 30 min
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 slice
  • Calories: About 720

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