01 -
Preheat the oven to 350 degrees F. Place the butter in a 9x13-inch baking dish and set it in the oven until melted, then remove the dish carefully.
02 -
In a large bowl, whisk 1 1/2 cups sugar, 4 tablespoons cocoa, flour, baking powder, salt, and espresso powder if using. Stir in the milk and vanilla until a thick, smooth batter forms.
03 -
Spoon the batter evenly over the melted butter in the baking dish. Do not stir the batter into the butter.
04 -
In a separate bowl, mix 2 cups sugar with 1/2 cup cocoa powder. Sprinkle this mixture evenly over the batter, reaching the edges of the pan.
05 -
Slowly pour the boiling water over the entire surface. Do not stir after adding the water.
06 -
Bake for 35-40 minutes, until the top is set and lightly crackled. The bottom should remain loose and saucy.
07 -
Let the cobbler cool for 15 minutes before scooping. Serve warm with vanilla ice cream or whipped cream if desired.