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Preheat the oven to 350°F. Grease an 18x13 inch pan thoroughly.

In a medium saucepan, combine 1 cup water, 1 cup butter, and 3 tablespoons cocoa powder. Bring the mixture to a boil over medium heat.

In a large bowl, whisk together 2 cups all-purpose flour, 2 cups granulated sugar, 1 teaspoon baking soda, and 1/2 teaspoon salt.

In a separate medium bowl, mix together 1/2 cup sour cream, 2 eggs, and 1 teaspoon vanilla extract.

Pour the sour cream mixture into the dry ingredients. Then, carefully pour the hot cocoa mixture from the saucepan into the bowl with the other ingredients. Stir until the batter is smooth and well combined.

Pour the prepared cake batter into the greased 18x13 inch pan. Bake for 15-20 minutes, or until the cake is set and a toothpick inserted into the center comes out clean.

While the cake is baking, prepare the frosting. In a saucepan, bring 6 tablespoons milk, 3 tablespoons cocoa powder, and 1/2 cup butter to a boil.

Remove the frosting mixture from the heat and immediately whisk in 3 3/4 cups powdered sugar until the frosting is smooth and free of lumps.

Once the cake is out of the oven, immediately pour the hot frosting over the hot cake, spreading it evenly across the surface.

Let the cake set for 10 minutes to allow the frosting to firm up slightly. Then, slice and serve warm or at room temperature.


Preheat the oven to 350°F. Grease an 18x13 inch pan thoroughly.

In a medium saucepan, combine 1 cup water, 1 cup butter, and 3 tablespoons cocoa powder. Bring the mixture to a boil over medium heat.

In a large bowl, whisk together 2 cups all-purpose flour, 2 cups granulated sugar, 1 teaspoon baking soda, and 1/2 teaspoon salt.

In a separate medium bowl, mix together 1/2 cup sour cream, 2 eggs, and 1 teaspoon vanilla extract.

Pour the sour cream mixture into the dry ingredients. Then, carefully pour the hot cocoa mixture from the saucepan into the bowl with the other ingredients. Stir until the batter is smooth and well combined.

Pour the prepared cake batter into the greased 18x13 inch pan. Bake for 15-20 minutes, or until the cake is set and a toothpick inserted into the center comes out clean.

While the cake is baking, prepare the frosting. In a saucepan, bring 6 tablespoons milk, 3 tablespoons cocoa powder, and 1/2 cup butter to a boil.

Remove the frosting mixture from the heat and immediately whisk in 3 3/4 cups powdered sugar until the frosting is smooth and free of lumps.

Once the cake is out of the oven, immediately pour the hot frosting over the hot cake, spreading it evenly across the surface.

Let the cake set for 10 minutes to allow the frosting to firm up slightly. Then, slice and serve warm or at room temperature.
