Ingredients
The Base
- 1 3/4 cups all-purpose flour
- 1/4 cup cornstarch
- 1 cup unsweetened cocoa powder
- 2 teaspoons baking soda
- 1 teaspoon baking powder
- 1/2 teaspoon kosher salt
- 1 cup granulated sugar
- 1 cup dark brown sugar, firmly packed
- 1/2 cup vegetable oil
- 1 cup mayonnaise
- 3 whole eggs plus 1 egg yolk
- 1/2 cup milk
- 1 tablespoon vinegar
- 2 teaspoons vanilla extract
- 1 cup hot coffee (or 1 cup hot water mixed with 2 teaspoons instant espresso powder)
The Frosting
- 2 cups unsalted butter, at room temperature
- 1 1/2 cups powdered sugar
- 3 tablespoons corn syrup
- 1 teaspoon vanilla extract
- A pinch of kosher salt
- 3/4 cup warm water
- 3/4 cup Dutch process cocoa powder (or unsweetened cocoa powder)
- 10 oz dark chocolate chips, melted and slightly cooled
Instructions on the next page 👇👇