½ cup butter, melted
1 ½ cups granulated sugar
½ cup plus 3 tablespoons unsweetened cocoa powder, divided
2 cups self-rising flour
½ teaspoon salt
1 cup milk
1 teaspoon espresso powder
2 teaspoons vanilla
2 cups light brown sugar
3 cups boiling water
Preheat the oven to 350 F. Place the butter into a 9x13-inch baking dish and swirl to coat all the sides. Set aside.
In a bowl, combine the sugar, 3 tablespoons cocoa powder, flour, salt, milk, vanilla, and espresso powder. Pour the mixture over the melted butter.
In another bowl, combine the brown sugar and remaining ½ cup cocoa powder. Sprinkle this mixture over the batter, and pour the boiling water on top.
Bake for 35 to 40 minutes or until top is set. Cool for 15 to 20 minutes before serving.