Go Back
–+ servings
Two brownies stacked on top of each other on an orange plate

20 Minute Sheet Cake Brownies With Fudgy Icing

Nancy Blackstone
These thin brownies with a thick fudge frosting are a chocolate treat that can be shared with friends and family.
4.89 from 9 votes
Print Recipe Pin Recipe
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Course Dessert
Cuisine American
Servings 35 2" x 2" Brownies
Calories 223 kcal

Ingredients
 
 

Brownies

  • 2 cups flour
  • 2 cups sugar
  • 2 sticks butter ½ pound
  • 4 tablespoons unsweetened cocoa powder
  • 1 cup water
  • ½ cup milk
  • 1 tablespoon vinegar
  • 2 large eggs
  • 1 teaspoon baking soda
  • 1 teaspoon vanilla extract

Icing

  • 1 stick butter 8 tablespoons
  • 4 tablespoons unsweetened cocoa
  • 6 tablespoons milk
  • 1 pound powdered sugar
  • 1 teaspoon vanilla
  • 1 cup chopped pecans

Instructions
 

  • Preheat oven to 400 degrees. Spray jelly roll pan with non-stick cooking spray.

Brownies

  • In a large bowl, mix the flour and sugar together and set aside.
  • Add 2 sticks of butter, 4 tablespoons of cocoa and 1 cup of water to a saucepan. Mix and heat over medium heat just until it begins to boil. Add to flour/sugar mixture and mix well. 
  • Add 1 tablespoon of vinegar to ½ cup of milk and stir. Mix in with the flour mixture.
  • Add eggs, baking soda and 1 teaspoon of vanilla to batter and combine well. 
  • Pour batter in a 10 x 15 jelly roll pan and bake for 20 minutes.

Icing

  • While brownies are baking, melt 1 stick of butter in a saucepan. 
  • Add 4 tablespoons of cocoa and 6 tablespoons of milk and mix well.
  • Remove from heat and stir in 1 pound of powdered sugar, 1 teaspoon of vanilla and 1 cup of pecans. Apply frosting on brownies as soon as they are removed from the oven.

Notes

For best results use a 10 x 15 jelly roll pan to bake brownies
Margarine can be substituted for butter
Walnuts or other nuts can be substituted for pecans in the icing, or you can eliminate the nuts altogether 
If you prefer a thicker layer of icing, double the icing recipe

Nutrition

Calories: 223kcalCarbohydrates: 31gProtein: 2gFat: 11gSaturated Fat: 5gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gTrans Fat: 1gCholesterol: 32mgSodium: 108mgPotassium: 53mgFiber: 1gSugar: 25gVitamin A: 269IUVitamin C: 1mgCalcium: 16mgIron: 1mg
Keyword 1950's brownies, 1960's brownies, Brownies, chocolate, Fudge, fudge brownies, iced brownies, Jelly Roll Pan, Vintage Brownie recipe
Tried this recipe?Let us know how it was!