Preparing The Cake Batter
Preheat The Oven: Set your oven to 350°F (175°C). Grease and flour your 13×9 inch baking pan to prevent sticking.
Combine Dry Ingredients: In a large mixing bowl, combine 2 cups of all-purpose flour and 2 cups of granulated sugar.
Create Cocoa Mixture: In a medium saucepan, melt 1/2 cup of unsalted butter with 1/2 cup of vegetable oil and 1 cup of water. Bring the mixture to a boil, then remove from heat and whisk in 4 tablespoons of unsweetened cocoa powder until smooth.
Mix Batter: Pour the cocoa mixture over the flour and sugar, stirring until combined. In a separate bowl, whisk together 1/2 cup of buttermilk, 2 large eggs, 1 teaspoon of baking soda, 1 teaspoon of vanilla extract, and 1/4 teaspoon of salt. Add this mixture to the main batter and stir until smooth and well incorporated.
Baking The Cake
Pour And Spread: Pour the batter into the prepared baking pan, spreading it evenly with a spatula.
Bake: Place the pan in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Remove the cake from the oven and place it on a cooling rack. Allow it to cool completely before adding the frosting.
Making The Frosting
Melt Butter: In a medium saucepan, melt 1/2 cup of unsalted butter over medium heat.
Add Cocoa: Stir in 4 tablespoons of unsweetened cocoa powder and 6 tablespoons of milk, bringing the mixture to a boil while stirring constantly.
Add Vanilla And Sugar: Remove from heat and stir in 1 teaspoon of vanilla extract. Gradually add 3 3/4 cups of powdered sugar, whisking until the frosting is smooth and thick. For an extra touch, you can stir in 1 cup of chopped pecans.
Assembling The Cake
Frosting The Cake: Once the cake is completely cool, pour the frosting over the top. Use a spatula to spread the frosting evenly across the cake, making sure to cover all edges.
Let It Set: Allow the frosting to set for a few minutes before slicing and serving.
Decorating Ideas
Simple Decoration: Dust the top with a light layer of powdered sugar for a classic look.
Advanced Techniques: Create a stencil design with cocoa powder or add edible glitter for a festive touch.