close up of chocolate sheet cake with a thick whipped frosting. Feature image

Old Fashioned Chocolate Sheet Cake

This moist, chocolate sheet cake is easy to make for birthdays, potlucks, and any time you want a quick dessert.
Course Dessert
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 12
Author Marye Audet


  • 1 1/2 cups unsweetened cocoa powder
  • 1 1/2 cups flour
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 1 1/2 cup butter room temperature
  • 2 cups sugar
  • 6 eggs
  • 2 teaspoons vanilla extract
  • 1 cup sour cream


  • 1 quart heavy cream
  • 1 4- serving packages chocolate fudge instant pudding mix
  • 3 tablespoons powdered sugar



  • Preheat the oven to 350F.
  • Grease a 13x9-inch pan and set aside.
  • Combine the cocoa, flour, baking powder, and salt in a bowl and set aside.
  • Beat the butter and sugar until light and fluffy.
  • Add egg, one at a time, and beat well after each.
  • Stir in the vanilla.
  • With mixer on low blend in 1/3 of the flour mixture.
  • Add 1/2 the sour cream.
  • Blend in 1/3 of the flour mixture.
  • Add the rest of the sour cream.
  • Stir in the remaining flour mixture.
  • Spoon into the prepared pan.
  • Bake for 30 to 35 minutes, or until done.
  • Cool.


  • Add the cream, pudding mix, and powdered sugar to the bowl of a mixer.
  • Whip until light and fluffy.
  • Spread thickly on cooled cake.