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5 from 3 votes

Granny's Scrumptious Chocolate Sheet Cake

Chocolate sheet cake made with cocoa--this cake is moist, full of chocolate flavor and gets better every day!
Prep Time25 mins
Cook Time20 mins
Total Time45 mins
Servings: 12 servings
Calories: 618kcal
Author: Lucy Brewer



  • 2 cups all-purpose flour
  • 1/8 tsp salt
  • 2 cups sugar
  • 2 sticks unsalted butter
  • ¼ cup cocoa
  • 1 cup water
  • 1 tsp baking soda
  • ½ cup buttermilk
  • 2 eggs
  • 1 tsp vanilla


  • 12 tbsp butter
  • 6 tbsp milk (use whole milk or half and half)
  • ¼ cup cocoa
  • 3 3/4 cups powdered sugar, sifted
  • 1 tsp vanilla
  • 1 cup chopped toasted pecans (optional)


  • Preheat oven to 375. Butter and flour a half-sheet pan (18x12) or jelly roll pan (15x10).
  • Sift flour and salt into large bowl. Add sugar and whisk until blended.
  • Combine butter, cocoa, and water in a saucepan. Bring to a boil and pour over the flour and sugar. Whisk until blended.
  • Add the soda, buttermilk, eggs, and vanilla. Whisk until blended and smooth. Pour into greased and floured baking pan.
  • Bake for 12-20 minutes, checking cake after 12. Cake is done when tester comes out clean but be careful not to overcook.


  • While cake is baking, bring the butter, milk and cocoa to a boil in a saucepan and pour over the powdered sugar. Add vanilla and pecans (if using). Mix well and immediately spread on warm cake.