Recreate Michigan’s chocolatey retro treat at home.

Simply Recipes / Ciara Kehoe

When you’re searching for a delicious dessert, nothing beats a classicchocolate cake.

What makes a simple chocolate cake even better?

Bumpy cake on a small plate with cross-section facing forward

Simply Recipes / Ciara Kehoe

That, in a nutshell, is bumpy cake.

What Is Bumpy Cake?

The original bumpy cake was created in 1913 atSanders Chocolate & Ice Cream Shoppein Detroit, Michigan.

Bumpy cake close-up (cut into individual slices with one slice facing camera to show cross-section cut)

Simply Recipes / Ciara Kehoe

It consists of a devils food cake with bumps of buttercream across the top.

Pourable fudge finishes it off, making for a shiny coating.

My recipe starts with a one-bowl chocolate cakeno mixer required.

Parchment paper-lined baking pan for bumpy cake recipe

Simply Recipes / Ciara Kehoe

This helps keep the impressive cake as low-stress as possible and shrinks the number of dirty dishes.

Its an iconic dessert in Michigan and a favorite in my arsenal of dessert recipes.

No Piping Bag?

Bumpy cake dry ingredients whisked together in a bowl

Simply Recipes / Ciara Kehoe

If you dont have one, grab a zip-top bag.

Cut the tip off of one of the bottom corners and use it just like a piping bag.

Line the bottom of the pan with parchment paper to ensure the cake doesnt stick to the pan.

Bump cake batter in a bowl

Simply Recipes / Ciara Kehoe

Mix to combine until the mixture is free of any large clumps.

Mix in the eggs and oil, then mix in the buttermilk and vanilla extract.

Pour the cake batter into the prepared pan.

Baked bumpy cake in the parchment paper-lined baking pan

Simply Recipes / Ciara Kehoe

Bake until a toothpick inserted into the center comes out clean, 22 to 25 minutes.

In the bowl of a stand mixer, beat the butter on medium speed until pale and fluffy.

Mix in 2 cups of powdered sugar, the milk, vanilla extract, and salt on medium-low speed.

Frosting in a stand mixer bowl for Michigan bumpy cake recipe

Simply Recipes / Ciara Kehoe

Gradually mix in 2 1/2 cups of powdered sugar on low speed until the mixture comes together.

Turn the speed up to medium and whip the frosting until very thick but fluffy, about 1 minute.

you’re free to add up to 1/2 cup of powdered sugar if the mixture isnt thick enough.

Frosting piped in long horizontal lines onto the cake for bumpy cake recipe

Simply Recipes / Ciara Kehoe

Once the cake is very cold, add the frosting to a piping bag or a zip-top plastic bag.

Snip the corner making a hole an inch wide.

Return the cake to the freezer for at least 30 minutes while you make the fudge topping.

Frosting “bumps” added to bumpy cake

Simply Recipes / Ciara Kehoe

In a saucepan on medium heat, melt the butter.

Mix in the sugar, cocoa powder, buttermilk, corn syrup, and salt.

Whisk until smooth and bring the mixture to a rolling boil.

Butter melting in a sauce pan over a portable induction stove for bumpy cake recipe

Simply Recipes / Ciara Kehoe

Cook for 3 minutes without stirring.

Remove from the heat and whisk in the sifted powdered sugar and vanilla extract until smooth.

Let the topping cool slightly for 10 minutes so its not too hot for pouring.

Chocolate fudge boiling on the stove for bumpy cake recipe

Simply Recipes / Ciara Kehoe

Gently tilt the cake pan to move the fudge around to cover the whole top of the cake.

Move quickly since the fudge topping will set up as it chills.

it’s possible for you to use an offset spatula to help nudge it around.

Bumpy cake chocolate fudge whisked together in the sauce pan off the stove

Simply Recipes / Ciara Kehoe

Return the cake to the freezer to set for another 15 minutes before slicing and serving.

Store leftovers in an airtight container in the fridge for up to 5 days.

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Chocolate fudge added to the cake pan with the bumpy cake

Simply Recipes / Ciara Kehoe

Pan moved from side to side to spread chocolate fudge topping for bumpy cake recipe

Simply Recipes / Ciara Kehoe

Bumpy cake on a small plate with cross-section facing forward

Simply Recipes / Ciara Kehoe