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5 from 12 votes

Zucchini Texas Sheet Cake

Zucchini Texas Sheet Cake is a crowd pleasing chocolate zucchini cake with a deliciously rich buttermilk chocolate frosting.
Prep Time20 mins
Cook Time20 mins
Total Time40 mins
Course: Dessert
Cuisine: American
Keyword: chocolate sheet cake, chocolate zucchini cake, Texas sheet cake recipe
Servings: 24
Calories: 305kcal
Author: Sandra


  • 2 cups sugar
  • ¾ cup oil
  • 3 eggs
  • 1 teaspoon salt
  • 1 ½ teaspoon baking soda
  • ½ cup cocoa powder
  • 1 teaspoon cinnamon
  • 1 ½ teaspoon baking powder
  • 2 teaspoon vanilla
  • 2 ½ cups flour
  • ½ cup milk
  • 2 cups grated or shredded zucchini


  • 1/2 cup butter
  • 6 tablespoons buttermilk
  • 4 tablespoon cocoa
  • 1 tablespoon vanilla
  • 3 3/4 cups powdered sugar


  • Preheat oven 350 degrees. Prepare a jelly roll pan by spraying a half sheet pan with cooking spray. Set aside.
  • Blend together sugar, oil, and eggs. 
  • In a separate bowl combine flour, salt, baking soda, cocoa, and cinnamon and baking powder. 
  • With the mixer on medium, add flour mixture to the sugar and egg mixture. Then slowly add milk and zucchini until well combined.
  • Pour into prepared pan. Bake for 18-20 minutes.
  • In a microwave safe medium sized mixing bowl add the butter, cover, and heat for 1 minute in the microwave.
  • Remove from microwave. Stir in vanilla and buttermilk, place back in the microwave and heat for 30 seconds, stir, then heat for another 30 seconds, stir, heat for 30 seconds and stir and then heat for another 30 seconds.
  • Remove from microwave and stir in cocoa and powder sugar, until well combined. Place back in the microwave and heat for 30 seconds, stir. Heat for another 30 seconds and stir, repeat 1 more time if needed until frosting is smooth and there are no clumps.
  • Pour over brownies, and spread evenly.
  • Let frosting cool and harden. Cut and serve. Enjoy!


Serving: 1slice | Calories: 305kcal | Carbohydrates: 48g | Protein: 3g | Fat: 12g | Saturated Fat: 3g | Cholesterol: 31mg | Sodium: 182mg | Potassium: 150mg | Fiber: 1g | Sugar: 36g | Vitamin A: 205IU | Vitamin C: 3.5mg | Calcium: 35mg | Iron: 1.2mg