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Bumpy Cake

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Bumpy Cake

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Bumpy Cake Recipe
Bumpy Cake Recipe

Originally created in the early 1900s by the Sanders Chocolates company in Detroit (where the ice cream float was also invented), this cake sports a poured fudge frosting over “bumps” of vanilla buttercream, creating the name by which Midwesterners have known and loved it for many years: Bumpy Cake.

At a glance

Prep
40 mins.
Bake
33 mins. to 35 mins.
Total
2 hrs 13 mins.
Yield
one 9″ x 13″ pan

Nutrition information

Measuring Standards

Ingredients

Cake

  • 1/2 cup Dutch-process cocoa
  • 1/2 cup hot brewed coffee or water
  • 1/2 cup vegetable oil
  • 1 cup buttermilk
  • 1 1/2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 2 teaspoons vanilla extract
  • 2 large eggs
  • 1 3/4 cups granulated sugar
  • 2 cups King Arthur Unbleached All-Purpose Flour

Buttercream

  • 6 tablespoons unsalted butter, at room temperature
  • 1/8 teaspoon salt
  • 2 cups confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract
  • 1 to 2 tablespoons milk or half & half, as needed

Fudge Frosting

  • 1/2 cup buttermilk
  • 2 tablespoons dark corn syrup
  • 8 tablespoons (1/2 cup) unsalted butter
  • 1/2 cup Dutch-process cocoa
  • 1/4 teaspoon salt
  • 4 cups confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract

Cake

  • 1 1/2 ounces Dutch-process cocoa
  • 4 ounces hot brewed coffee or water
  • 3 1/2 ounces vegetable oil
  • 8 ounces buttermilk
  • 1 1/2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 2 teaspoons vanilla extract
  • 2 large eggs
  • 12 1/4 ounces granulated sugar
  • 8 1/2 ounces King Arthur Unbleached All-Purpose Flour

Buttercream

  • 3 ounces unsalted butter, at room temperature
  • 1/8 teaspoon salt
  • 8 ounces confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract
  • 1/2 to 1 ounce milk or half & half, as needed

Fudge Frosting

  • 4 ounces buttermilk
  • 1 3/8 ounces dark corn syrup
  • 4 ounces unsalted butter
  • 1 1/2 ounces Dutch-process cocoa
  • 1/4 teaspoon salt
  • 16 ounces confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract

Cake

  • 43g Dutch-process cocoa
  • 113g hot brewed coffee or water
  • 99g vegetable oil
  • 227g buttermilk
  • 1 1/2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 2 teaspoons vanilla extract
  • 2 large eggs
  • 347g granulated sugar
  • 241g King Arthur Unbleached All-Purpose Flour

Buttercream

  • 85g unsalted butter, at room temperature
  • 1/8 teaspoon salt
  • 227g confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract
  • 14g to 28g milk or half & half, as needed

Fudge Frosting

  • 113g buttermilk
  • 39g dark corn syrup
  • 113g unsalted butter
  • 43g Dutch-process cocoa
  • 1/4 teaspoon salt
  • 454g confectioners’ sugar, sifted
  • 1 teaspoon vanilla extract

Instructions

  1. Preheat the oven to 350°F. Grease a 9″ x 13″ pan.
  2. For the cake: Place the cocoa in a large mixing bowl and pour the hot coffee (or water) over it. Mix until smooth, then add the oil and buttermilk and mix to combine.
  3. Add the baking soda and salt, beat for 30 seconds, then add the vanilla and eggs. Mix until smooth. Add the sugar and flour and beat for 2 minutes at medium speed. Scrape the bowl, beat for 30 seconds more, then pour into the prepared pan.
  4. Bake for 33 to 35 minutes, until the top springs back when lightly pressed and the edges just begin to pull away from the pan. Remove from the oven and cool for 30 minutes on a rack, then put in the freezer for at least 1 hour.
  5. To make the buttercream: Beat the butter and salt together until pale and fluffy. Add the confectioners’ sugar and vanilla and beat until the frosting is fluffy, then add 1 tablespoon of milk (or half & half) as needed for a smooth consistency. Transfer the frosting to a piping bag with a 1/2″ round tip. Chill for 5 to 10 minutes before piping if really soft.
  6. Pipe the buttercream across the cake’s shorter (9″) dimension in seven 1/2″-diameter strips, edge to edge across the cake. The lines should be 1″ apart. Return to the freezer for at least 30 minutes to set the buttercream.
  7. To make the fudge frosting: In a medium saucepan with a heavy bottom, combine the buttermilk, dark corn syrup, butter, cocoa, and salt over medium heat. Bring to a boil and cook for 2 to 3 minutes, until the bubbles make a snapping sound as they pop. Turn the heat to low and whisk in the confectioners’ sugar. Whisk until the sugar melts and the mixture is smooth and glossy. Remove from the heat, stir in the vanilla, and pour into a large glass measuring cup. Set aside to cool until just slightly warm.
  8. To finish: Remove the cake from the freezer and pour half of the warm fudge frosting over the cake in long, even strokes to cover the buttercream bumps completely. Tilt the pan to let the frosting flow over the cake, if necessary, to cover the top.
  9. Return the pan to the freezer to 5 to 10 minutes. Repeat with the rest of the frosting to completely cover the bumps and the cake. If the frosting is too thick, heat it in 5-second bursts in the microwave, stirring until smooth and pourable. Return the cake to the refrigerator for another 20 minutes to set the frosting before cutting.
  10. Store this cake in the refrigerator until ready to serve. It will keep, covered and refrigerated, for up to 1 week.

Nutrition Information

  • Serving Sizeone 2″ square, 95g
  • Servings Per Batch24
Amount Per Serving:
  • Calories330
  • Calories from Fat108
  • Total Fat12g
  • Saturated Fat6g
  • Trans Fat0g
  • Cholesterol35mg
  • Sodium190mg
  • Total Carbohydrate54g
  • Dietary Fiber1g
  • Sugars44g
  • Protein3g

* The nutrition information provided for this recipe is determined by the ESHA Genesis R&D software program. Substituting any ingredients may change the posted nutrition information.

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