Bumpy Cake
A sweet slice of Motor City history
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If you grew up in Detroit, chances are you’ve crossed paths with Bumpy Cake—a true hometown classic. First made famous by Sanders in the early 1900s, this cake is instantly recognizable thanks to its signature rows of buttercream “bumps” hidden beneath a glossy layer of chocolate fudge icing. For many Michiganders, it’s more than dessert—it’s pure nostalgia.
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At its core, Bumpy Cake is a simple chocolate cake elevated by clever technique. A rich devil’s food base sets the stage, while chilled buttercream lines create the iconic bumps. The magic happens when warm fudge icing is poured over, flowing around the buttercream without melting it, then setting into that unmistakable finish.
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Perfect for birthdays, potlucks, or holiday tables, this cake slices beautifully, feeds a crowd, and delivers big chocolate flavor without fuss. More than just a treat, it’s a piece of Detroit’s culinary heritage—still as beloved today as it was generations ago.
🍫 Detroit Bumpy Cake
📝 Ingredients
| Component | Ingredients |
|---|---|
| Cake | 1 box devil’s food chocolate cake + eggs, oil, water (per box directions) |
| Buttercream | 4 tbsp butter, 1½ cups powdered sugar, ½ tsp vanilla, 1 tbsp milk, pinch of salt |
| Fudge Icing | ½ cup buttermilk, 2 tbsp corn syrup, ½ cup butter, ⅔ cup unsweetened cocoa powder, 3½ cups powdered sugar, pinch of salt, ½ tsp vanilla |
👩🍳 Preparation
- Bake the Cake
Preheat oven to 350°F (175°C). Grease a 9×13-inch pan. Prepare cake mix as directed, bake, and cool completely. - Make the Buttercream
Beat butter until smooth. Add sugar, milk, vanilla, and salt; mix until creamy. Chill for 15 minutes, then pipe straight lines across the cooled cake (about 1 inch apart). Freeze while preparing icing. - Cook the Fudge Icing
In a saucepan, combine buttermilk, corn syrup, butter, cocoa, and salt. Bring to a simmer, stirring often, for 3 minutes. Add powdered sugar gradually until smooth, then stir in vanilla. Cool for 10 minutes. - Finish the Cake
Remove cake from freezer. Pour icing evenly over the buttercream bumps. Chill for 30 minutes to set before slicing.
💡 Serving Notes
- Slice into squares for easy sharing.
- Best enjoyed chilled, but still delicious at room temperature.
- A guaranteed crowd-pleaser for anyone craving chocolate nostalgia.
