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Just the thing for that bumper crop of zucchini! It keeps this party-ready sheet cake super moist, while two types of chocolate -- semisweet chunks and cocoa powder -- deliver big flavor. Top with tangy-cream cheese frosting, and if you want make the dessert a real showstopper, sugared zucchini blossoms.

Martha Stewart Living, July/August 2018


Read the full recipe after the video.

Recipe Summary test

30 mins
1 hr
Serves 10 to 12




Instructions Checklist
  • Cake: Preheat oven to 350 degrees. Butter a 10-by-15-inch jelly-roll pan. Line bottom with parchment, leaving a 2-inch overhang on 2 sides; butter parchment.

  • Whisk together flour, cocoa, granulated sugar, baking powder, baking soda, and salt. In another bowl, whisk together eggs, butter, and vanilla. Stir egg mixture into flour mixture until batter loosens, about 1 minute. Stir in zucchini and chocolate (batter will be quite thick). Spread evenly into prepared pan; smooth top with a spatula. Bake until a tester inserted into cake comes out clean, 28 to 30 minutes. Transfer to a wire rack; let cool completely. Remove from pan.

  • Frosting: Beat butter on medium-high speed until smooth, 2 minutes. Add cream cheese; beat to combine. Reduce speed to medium-low and add confectioners' sugar, 1/2 cup at a time, beating until thickened. Beat in vanilla. Spread frosting over cake, scatter with zucchini blossoms, and serve. Cake can be refrigerated (without blossoms) up to 8 hours.