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5 from 1 vote

Chocolate Sheet Cake

Ingredients

Cake

  • 2 cups flour (300g)
  • 2 cups sugar (415g)
  • 1 tsp baking soda
  • 1/2 cup butter (115g)
  • 1/4 cup cocoa powder (20g)
  • 1/2 cup buttermilk *
  • 2 large eggs
  • 1 tsp vanilla
  • 1 cup water
  • 1/2 cup oil (vegetable or canola)

Frosting

  • 1/2 cup butter (115g)
  • 1/4 cup cocoa powder (20g)
  • 9 tbsp milk
  • 2 lbs powdered sugar (907g)
  • 1 tsp vanilla

Instructions

Cake

  • Preheat oven to 400 degrees (200c)
  • If you don't have buttermilk, add 2 tsp of vinegar to milk and let it sit for 5 minutes
  • Combine dry ingredients (flour, sugar and baking soda) in a large mixing bowl
  • In a saucepan, heat to boiling point the butter, cocoa powder, water and oil
  • Pour over dry ingredients and mix on low speed until combined
  • Add vanilla to buttermilk and add the mixture slowly to the batter
  • Add eggs, one at a time
  • Increase mixer speed to medium and mix thoroughly until combined
  • Pour batter into a greased 11x15" pan. Cover edges with aluminum foil to prevent burning the sides.
  • Bake for 20 minutes

Frosting

  • Put powdered sugar into a large mixing bowl
  • In a saucepan, melt butter, milk, and cocoa powder
  • Pour over powdered sugar
  • Once cake is cooked, pour frosting over hot cake
  • Chill for at least 2-3 hours or overnight

Notes

*If you don't have buttermilk add 2 tsp of vinegar to milk and let it sit for 5 minutes.