01 -
Preheat oven to 350°F. Pour melted butter into a 9x9-inch baking dish and set aside.
02 -
In a large mixing bowl, whisk together flour, brown sugar, baking powder, salt, half of the granulated sugar (6 tablespoons), and half of the cocoa powder (2 tablespoons) until homogenous.
03 -
Add milk and vanilla extract to the dry mixture. Whisk until combined. Fold in semi-sweet chocolate chips until evenly distributed.
04 -
Pour batter over melted butter in the baking dish. Spread lightly to the edges without mixing into butter.
05 -
In a separate small bowl, whisk together the remaining granulated sugar (6 tablespoons) and cocoa powder (2 tablespoons). Sprinkle evenly over the batter in the baking dish.
06 -
Carefully pour hot water evenly over the entire dish without stirring. Bake uncovered for 40 to 50 minutes until a crust forms on top and the edges are set while the center remains slightly gooey.
07 -
Remove from oven and allow to cool for 10 minutes. Serve warm with optional toppings like ice cream, whipped cream, or fruit.