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Two cooled layers of One-Bowl Chocolate Zucchini Cake resting on a wire rack before frosting.

One-Bowl Chocolate Zucchini Cake


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5 from 19 reviews

Description

This decadent chocolate cake uses finely shredded zucchini to achieve a remarkably moist, fudgy crumb without any hint of vegetable flavor. Prepared entirely in one bowl, this fuss-free recipe delivers bakery-quality results perfect for any occasion.


Ingredients

  • 3 cups shredded zucchini
  • 2 cups all-purpose flour
  • 1/2 cup unsweetened natural cocoa powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 teaspoon espresso powder
  • 1 cup granulated sugar
  • 1 cup dark brown sugar, packed
  • 1/2 cup sour cream
  • 2/3 cup canola oil
  • 2 large eggs, room temperature
  • 1 teaspoon vanilla extract
  • 1 cup semi-sweet chocolate chips
  • 1/2 cup unsalted butter, softened
  • 3 cups confectioners’ sugar
  • 1/4 cup cocoa powder
  • 2 tablespoons cream


Instructions

  1. Prep the pans. Preheat oven to 350°F (177°C) and grease two 9-inch round cake pans, lining the bottoms with parchment paper.
  2. Combine dry base. Whisk together flour, cocoa, baking soda, baking powder, espresso powder, and salt in a large bowl until uniform.
  3. Mix wet ingredients. In a separate bowl, beat oil, sugars, eggs, sour cream, and vanilla until glossy before stirring in the shredded zucchini.
  4. Incorporate dry mixture. Add the flour mixture to the wet base and beat on medium speed until just combined.
  5. Fold in chips. Gently fold in the semi-sweet chocolate chips using a silicone spatula.
  6. Bake the layers. Pour batter into pans and bake for 28 to 32 minutes until a toothpick inserted into the center emerges clean.
  7. Cool the cake. Rest cakes in pans for one hour on a wire rack before inverting them to cool completely.
  8. Prepare the buttercream. Beat softened butter, confectioners’ sugar, cocoa, cream, salt, and vanilla until thick and creamy.
  9. Assemble and frost. Level the cooled cake layers, then stack and frost the top and sides with the prepared buttercream.

Notes

  • Use a fine-mesh box grater for the zucchini to ensure it melts seamlessly into the batter.
  • Always spoon and level your flour to avoid accidental over-measuring and a dense, dry crumb.
  • Bring your eggs and butter to room temperature to ensure a smooth, stable emulsion for the cake and frosting.
  • If your environment is warm, chill the finished cake briefly to help the buttercream set before slicing.
  • Prep Time: 15 mins
  • Cook Time: 32 mins
  • Category: Dessert
  • Method: Baking
  • Cuisine: American