Preparation Steps

• Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan or an 18x13 inch half sheet pan.
• In a large bowl, whisk together the flour, sugar, salt, and baking soda. Set aside.
• In a medium saucepan, combine 0.5 cup butter, vegetable oil, 0.25 cup cocoa powder, and water. Bring to a boil, then remove from heat.
• Pour the hot chocolate mixture over the dry ingredients and stir until just combined.
• Whisk in the buttermilk, eggs, and 1 teaspoon of vanilla extract until the batter is smooth.
• Pour the batter into the prepared pan and bake for 20 minutes, or until a toothpick inserted in the center comes out clean.
• While the cake is baking, prepare the frosting. In a saucepan, melt 0.5 cup butter, 0.25 cup cocoa powder, and milk over medium heat until it begins to boil.
• Remove from heat and whisk in the powdered sugar and 1 teaspoon of vanilla extract until smooth.
• Pour the warm frosting over the hot cake as soon as it comes out of the oven. Spread evenly and let it cool before slicing.