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Moist Chocolate Sheet Cake with Chocolate Fudge Frosting

This is the chocolate cake you bring to every birthday, potluck, and 'I need to make something impressive' moment. It bakes in a sheet pan so there's no stacking or leveling involved. The frosting goes on warm and sets into this glossy fudge layer that everyone loses their mind over.
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Prep Time 20 minutes
Cook Time 28 minutes
Total Time 48 minutes
Servings: 24 servings
Ingredients Method

Ingredients
  

  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 1 cup unsalted butter
  • 1 cup water
  • 1/4 cup unsweetened cocoa powder
  • 2 large eggs
  • 1/2 cup sour cream
  • 1 tsp vanilla extract
  • 1/2 cup unsalted butter for frosting
  • 3 tbsp unsweetened cocoa powder for frosting
  • 6 tbsp milk
  • 3 cups powdered sugar sifted

Method
 

  1. Preheat oven to 350°F and grease a 9x13-inch baking pan.
  2. Whisk flour, sugar, baking soda, and salt in a large bowl.
  3. Melt butter with water and cocoa powder in a saucepan over medium heat, then pour over flour mixture and stir to combine.
  4. Mix in eggs, sour cream, and vanilla until smooth, then pour into prepared pan and bake 25-28 minutes.
  5. While cake is finishing, melt frosting butter with cocoa powder and milk, then whisk in powdered sugar until smooth.
  6. Pour warm frosting over hot cake and spread evenly, then let set before slicing.