1-Prepping and Mixing the Batter: Begin by preheating your oven to 350°F and greasing an 18×13 inch pan. In a medium saucepan, combine 1 cup water, 1 cup butter, and 3 tablespoons cocoa powder; bring it to a boil over medium heat. While that’s heating, in a separate bowl, mix 2 cups flour, 2 cups sugar, 1 teaspoon baking soda, and 1/2 teaspoon salt until well combined.

2-Prepping and Mixing the Batter: In another bowl, whisk together 1/2 cup sour cream, 2 large eggs, and 1 teaspoon vanilla. Add the sour cream mixture to the flour mixture and stir gently. Once the cocoa mixture boils, remove it from the heat and pour it into the batter, mixing until smooth and free of lumps. This step ensures a consistent texture.

3-Baking and Frosting: Pour the batter into your prepared pan and smooth it evenly. Bake for 15-20 minutes or until the cake is set in the center. While the cake bakes, prepare the frosting by bringing 6 tablespoons milk, 3 tablespoons cocoa powder, and 1/2 cup butter to a boil in a saucepan. Remove from heat and stir in 3 3/4 cups powdered sugar until smooth and lump-free.

4-Baking and Frosting: Once the cake is out of the oven, pour the hot frosting over it and spread evenly. Let it set for about 10 minutes before serving. The total preparation time is around 30 minutes, including prep, baking, and setting, making it quick for working professionals or students.