For the Icing:
1/2 cup (1 stick) unsalted butter
1/4 cup unsweetened cocoa powder
6 tablespoons milk
1 teaspoon vanilla extract
4 cups powdered sugar
Directions
Preheat your oven to 350°F (175°C). Grease and flour a large baking sheet pan to prepare it for the cake batter.
In a large mixing bowl, combine the flour, granulated sugar, brown sugar, baking soda, and salt.
In a separate saucepan, melt the butter, vegetable oil, and cocoa powder together over medium heat. Once the mixture is fully melted and combined, stir in the boiling water. Pour this mixture into the dry ingredients and mix until well incorporated.
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