Ingredients
1 1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1/4 teaspoon salt
1 1/4 cups boiling water
1/2 cup cocoa powder
4 ounces semisweet chocolate chips
1 teaspoon instant espresso or instant coffee powder
10 tablespoons unsalted butter, softened
1 1/2 cups packed light brown sugar
3 large eggs
1/2 cup sour cream
2 teaspoons pure vanilla extract
1/2 cup unsalted butter
1 cup packed brown sugar
1/4 cup milk
2 cups confectioner's sugar
1 - 1 1/2 teaspoons Kosher salt
1 - 1 1/2 flaked sea salt
1/2 cup unsalted butter, softened
1 cup cocoa powder
1/2 cup vegetable oil
1 1/2 cup confectioner's sugar
Preparation
