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A rustic Triple Chocolate Zucchini Cake displayed beautifully on a dark wood table.

Triple Chocolate Zucchini Cake


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5 from 18 reviews

  • Author: Christine Feeney
  • Total Time: 1 hour 10 mins
  • Yield: 12 servings
  • Diet: Vegetarian

Description

This indulgent three-layer chocolate cake uses fresh garden zucchini to achieve a remarkably moist, fudgy crumb. Topped with a silky ganache-based buttercream, it is the perfect rustic centerpiece for late-summer gatherings.


Ingredients

  • 2 cups all-purpose flour
  • 3/4 cup natural cocoa powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 tablespoon espresso powder (optional)
  • 1 1/2 cups vegetable oil
  • 1 1/4 cups granulated sugar
  • 1 cup packed light brown sugar
  • 4 large eggs, room temperature
  • 1 cup sour cream, room temperature
  • 1 tablespoon vanilla extract
  • 2 cups finely grated zucchini
  • 1 1/2 cups semi-sweet chocolate chips
  • 1/2 cup heavy cream (for frosting)
  • 1 cup unsalted butter, softened
  • 3 cups powdered sugar


Instructions

  1. Prepare the pans. Preheat oven to 350ºF, butter three 8-inch cake pans, and line the bottoms with parchment paper.
  2. Whisk dry ingredients. Sift flour, cocoa, baking soda, baking powder, salt, and espresso powder into a bowl and stir to combine.
  3. Mix wet ingredients. Whisk vegetable oil, sugars, eggs, sour cream, and vanilla until smooth, then fold in the grated zucchini.
  4. Combine and bake. Stir the wet mixture into the dry ingredients, fold in chocolate chips, divide into pans, and bake for 35 to 40 minutes.
  5. Cool the layers. Rest cakes in pans for 10 minutes before inverting onto wire racks to cool completely.
  6. Whip the frosting. Melt chocolate with heavy cream; beat butter and cocoa, gradually add powdered sugar and cream, then fold in the melted chocolate until fluffy.
  7. Assemble the cake. Stack layers with buttercream between each, then frost the sides for a rustic finish and pipe decorative dollops on top.

Notes

  • Fine-grate your zucchini to ensure it melts seamlessly into the cake structure without leaving noticeable vegetable strands.
  • Use room temperature eggs and sour cream to prevent the melted chocolate in the frosting from seizing or becoming grainy.
  • Weigh your flour with a kitchen scale to avoid packing the cup, which can lead to a dry and dense crumb.
  • Chill the final assembled cake for 30 minutes before slicing to ensure the buttercream firms up for cleaner cuts.
  • Prep Time: 30 mins
  • Cook Time: 40 mins
  • Category: Dessert
  • Method: Baking
  • Cuisine: American