Bumpy Cake
A Sweet Slice of Detroit Tradition
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Bumpy Cake is a beloved dessert with deep roots in Detroit history. First popularized by Sanders in the early 20th century, this iconic treat is known for its unique design—soft rows of buttercream “bumps” hidden beneath a smooth layer of rich chocolate fudge icing. For many, it’s more than just cake—it’s a nostalgic taste of home.
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At its heart, this dessert is a simple chocolate sheet cake elevated by technique and texture. The buttercream ridges hold their shape under a warm fudge topping, which sets into a glossy finish while preserving the signature bumps underneath. The result is a striking cake with bold flavor and a memorable look.
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Perfect for celebrations, holidays, or gatherings, this cake is easy to slice, serves a crowd, and delivers classic chocolate indulgence with every bite.
🍫 Detroit Bumpy Cake
Ingredients
Cake
- 1 box devil’s food chocolate cake mix
- Eggs, oil, and water (as directed on package)
Buttercream
- 4 tbsp butter
- 1½ cups powdered sugar
- ½ tsp vanilla extract
- 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 extract
👩🍳 Instructions
Bake the Cake
Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan. Prepare the cake batter according to package instructions, bake, and allow it to cool completely.
Make the Buttercream
Beat butter until smooth and creamy. Add powdered sugar, milk, vanilla, and salt, mixing until fluffy. Chill the mixture for about 15 minutes, then pipe long straight lines across the cooled cake to form the signature “bumps.” Freeze briefly while preparing the icing.
Prepare the Fudge Icing
In a saucepan, combine buttermilk, corn syrup, butter, cocoa powder, and salt. Bring to a gentle simmer while stirring for about 3 minutes. Gradually whisk in powdered sugar until smooth, then stir in vanilla. Let cool slightly for about 10 minutes.
Finish the Cake
Remove the chilled cake from the freezer. Pour the warm fudge icing evenly over the buttercream-lined cake, allowing it to flow around the bumps. Refrigerate for about 30 minutes until set.
💡 Serving Tips
- Cut into squares for easy serving
- Best served chilled for clean slices
- Delicious at room temperature for a softer texture
- Perfect for birthdays, potlucks, and holidays
- A classic Detroit dessert with nostalgic appeal
