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5.0 from 6 votes

Chocolate Sheet Cake with Milk Chocolate Frosting

The BEST Homemade Chocolate Sheet Cake with Milk Chocolate Frosting is so quick and easy. 

Prep Time
10 mins
Cook Time
10 mins
Total Time
26 mins
Servings: 32
Course: Dessert
Cuisine: American

Ingredients

  • 2 cups flour
  • 2 cups sugar
  • 3/4 cup unsweetened cocoa powder
  • 2 teaspoons baking soda
  • 1 teaspoon salt
  • 2/3 cup oil
  • 1 cup buttermilk
  • 2 large eggs
  • 1 1/2 teaspoon vanilla
  • 1 cup hot water
Milk Chocolate Frosting:
  • 1 cup butter (softened)
  • 1/2 cup + 2 Tablespoons cocoa
  • 3 3/4 cups powdered sugar
  • 2-3 Tablespoons Heavy Cream, Whole Milk, or Half-n-Half

Instructions

    Cup of Yum
  1. Heat oven to 350 degrees. In a large mixing bowl, stir together flour, sugar, cocoa powder, baking soda, and salt.
  2. Add oil, buttermilk, eggs, and vanilla. Stir until combined. Fold in hot water. The cake batter will be thin and liquidy but that is how it is supposed to look.
  3. Pour cake batter in lightly greased baking sheet (approximately 17 x 13). Bake for 16-20 minutes or until toothpick comes out clean (be careful not to overbake). 
To make Milk Chocolate Frosting:
  1. In a large mixing bowl, whip butter for 3 minutes. Add cocoa powder, powdered sugar, and milk or cream. Whip for 2-3 minutes. Add more cream if needed. Continue to whip until light and creamy.
  2. Spread frosting over cooled cake. Sprinkle with chocolate chips or sprinkles, if so desired. Cut into squares.